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These PBRSUs were subject to a performance-based vesting condition related to three-year relative total shareholder return and a time-based vesting condition and also provided for the accumulation of dividend equivalent rights. On February 24, 2025, the performance condition for this award was certified at 25% of the target award (as adjusted for accumulated dividend equivalent rights). 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These PBRSUs were subject to a performance-based vesting condition related to three-year average adjusted return on equity and a time-based vesting condition and also provided for the accumulation of dividend equivalent rights. On February 24, 2025, the performance condition for this award was certified at 125% of the target award (as adjusted for accumulated dividend equivalent rights). 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The shares were sold at multiple prices ranging from $165 to $165.955. The Reporting Person undertakes to provide The Hanover Insurance Group, Inc. 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The shares were sold at multiple prices ranging from $165 to $165.275. The Reporting Person undertakes to provide The Hanover Insurance Group, Inc. (\"THG\"), any security holder of THG, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above."}],"balance_after":49177.594,"source":{"system":"sec-edgar","filing":"0001062993-24-019404","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299324019404/form4.xml","form_type":"4"}},{"id":1369828,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2024-11-12T21:41:30.000Z","date":"2024-11-11","kind":"sale","planned":false,"acquired":false,"shares":1578,"price":163.03,"value":257261.34,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on February 16, 2023 and intended to comply with the prior version of the rule."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $162.84 to $163.46. The Reporting Person undertakes to provide THG, any security holder of THG, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above."}],"balance_after":54090.594,"source":{"system":"sec-edgar","filing":"0001062993-24-018913","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299324018913/form4.xml","form_type":"4"}},{"id":1369827,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2024-11-12T21:41:30.000Z","date":"2024-11-11","kind":"sale","planned":false,"acquired":false,"shares":4098,"price":162.25,"value":664900.5,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on February 16, 2023 and intended to comply with the prior version of the rule."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $161.83 to $162.80. The Reporting Person undertakes to provide THG, any security holder of THG, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above."}],"balance_after":55668.594,"source":{"system":"sec-edgar","filing":"0001062993-24-018913","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299324018913/form4.xml","form_type":"4"}},{"id":1369826,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2024-11-12T21:41:30.000Z","date":"2024-11-11","kind":"sale","planned":false,"acquired":false,"shares":438,"price":160.976,"value":70507.488,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on February 16, 2023 and intended to comply with the prior version of the rule."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $160.75 to $161.74. The Reporting Person undertakes to provide THG, any security holder of THG, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above."}],"balance_after":59766.594,"source":{"system":"sec-edgar","filing":"0001062993-24-018913","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299324018913/form4.xml","form_type":"4"}},{"id":1369825,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2024-11-12T21:41:30.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":5886,"price":160.05,"value":942054.3,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on February 16, 2023 and intended to comply with the prior version of the rule."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $160 to $160.225. The Reporting Person undertakes to provide The Hanover Insurance Group, Inc. (\"THG\"), any security holder of THG, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above."}],"balance_after":60204.594,"source":{"system":"sec-edgar","filing":"0001062993-24-018913","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299324018913/form4.xml","form_type":"4"}},{"id":1383678,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2024-10-21T20:13:00.000Z","date":"2024-10-18","kind":"sale","planned":false,"acquired":false,"shares":12000,"price":155.0788,"value":1860945.6,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares was effected pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on February 16, 2023 and intended to comply with the prior version of the rule."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $155 to $155.305. The Reporting Person undertakes to provide The Hanover Insurance Group, Inc. 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The shares were sold at multiple prices ranging from $151.04 to $151.57. 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Such units vest on the third anniversary of the date of grant of the underlying restricted stock units."}],"balance_after":84256.892,"source":{"system":"sec-edgar","filing":"0001062993-23-008539","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299323008539/form4.xml","form_type":"4"}},{"id":1984819,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock Option (right to buy)","published_at":"2023-03-01T22:54:26.000Z","date":"2023-02-27","kind":"grant","acquired":true,"shares":13868,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Such options vest as to one-third of the shares on each of the first three anniversaries of the grant date."}],"balance_after":13868,"derivative":{"exercise_price":140.01,"expiration_date":"2033-02-27","underlying":"Common Stock","underlying_shares":13868},"source":{"system":"sec-edgar","filing":"0001062993-23-005400","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299323005400/form4.xml","form_type":"4"}},{"id":1984818,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2023-03-01T22:54:26.000Z","date":"2023-02-28","kind":"tax_withholding","acquired":false,"shares":5360,"price":139.48,"value":747612.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"Represents shares that were forfeited to pay withholding taxes upon the vesting of restricted stock units that were previously granted by the Issuer and vested on February 28, 2023.  In connection with vesting, any fractional shares were rounded up to the next whole share in accordance with the terms of the award agreement"}],"balance_after":84195.318,"source":{"system":"sec-edgar","filing":"0001062993-23-005400","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299323005400/form4.xml","form_type":"4"}},{"id":1984817,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2023-03-01T22:54:26.000Z","date":"2023-02-27","kind":"grant","acquired":true,"shares":3125,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Grant of restricted stock units under the Issuer's 2022 Long-Term Incentive Plan. Such units vest on the third anniversary of the date of grant."}],"balance_after":89554.923,"source":{"system":"sec-edgar","filing":"0001062993-23-005400","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299323005400/form4.xml","form_type":"4"}},{"id":1984816,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2023-03-01T22:54:26.000Z","date":"2023-02-27","kind":"grant","acquired":true,"shares":3342,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"On February 28, 2020, the Reporting Person was granted 3,582 (target) PBRSUs pursuant to the Issuer's 2014 Long-Term Incentive Plan. These PBRSUs were subject to a performance-based vesting condition related to three-year relative total shareholder return and a time-based vesting condition and also provided for the accumulation of dividend equivalent rights. On February 27, 2023, the performance condition for this award was certified at 86.96% of the target award (as adjusted for accumulated dividend equivalent rights) for the number of shares indicated. This award remained subject to the time-based vesting condition and vested on February 28, 2023."}],"balance_after":86429.923,"source":{"system":"sec-edgar","filing":"0001062993-23-005400","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299323005400/form4.xml","form_type":"4"}},{"id":1984815,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2023-03-01T22:54:26.000Z","date":"2023-02-27","kind":"grant","acquired":true,"shares":4558,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On February 28, 2020, the Reporting Person was granted 3,268 (target) performance-based restricted stock units (\"PBRSUs\") pursuant to the Issuer's 2014 Long-Term Incentive Plan. These PBRSUs were subject to a performance-based vesting condition related to three-year average adjusted return on equity and a time-based vesting condition and also provided for the accumulation of dividend equivalent rights. On February 27, 2023, the performance condition for this award was certified at 130% of the target award (as adjusted for accumulated dividend equivalent rights) for the number of shares indicated. This award remained subject to the time-based vesting condition and vested on February 28, 2023."}],"balance_after":83087.923,"source":{"system":"sec-edgar","filing":"0001062993-23-005400","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299323005400/form4.xml","form_type":"4"}},{"id":2070003,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2023-01-04T21:47:49.000Z","date":"2022-12-30","kind":"grant","acquired":true,"shares":60.473,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Grant of restricted stock units under the Issuer's 2022 Long-Term Incentive Plan upon the accrual of dividend rights associated with restricted stock units previously granted by the Issuer. Such units vest on the third anniversary of the date of grant of the underlying restricted stock units."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Due to a clerical error, the number reported in column 5 of the Form 4 filed on March 9, 2022 and all subsequent filings was understated by 300 shares. All other line items in the Form 4 filed on March 9, 2022 and all subsequent filings are correct. The amount of securities beneficially owned by the reporting person reported in column 5 of this Form 4 corrects the previous error."}],"balance_after":78529.923,"source":{"system":"sec-edgar","filing":"0001062993-23-000319","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299323000319/form4.xml","form_type":"4"}},{"id":2145827,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-10-04T20:31:04.000Z","date":"2022-09-30","kind":"grant","acquired":true,"shares":58.704,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Grant of restricted stock units under the Issuer's 2022 Long-Term Incentive Plan upon the accrual of dividend rights associated with restricted stock units previously granted by the Issuer. Such units vest on the third anniversary of the date of grant of the underlying restricted stock units."}],"balance_after":78169.45,"source":{"system":"sec-edgar","filing":"0001062993-22-020334","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322020334/form4.xml","form_type":"4"}},{"id":2220491,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-06-28T19:59:53.000Z","date":"2022-06-24","kind":"grant","acquired":true,"shares":50.571,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Grant of restricted stock units under the Issuer's 2022 Long-Term Incentive Plan upon the accrual of dividend rights associated with restricted stock units previously granted by the Issuer. Such units vest on the third anniversary of the date of grant of the underlying restricted stock units."}],"balance_after":78110.746,"source":{"system":"sec-edgar","filing":"0001062993-22-015558","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322015558/form4.xml","form_type":"4"}},{"id":2266495,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock Option (right to buy)","published_at":"2022-05-18T20:12:55.000Z","date":"2022-05-17","kind":"exercise","acquired":false,"shares":47510,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Mr. Farber \"net exercised\" 47,510 options. The options were granted to Mr. Farber in 2018, and were scheduled to expire ten years after issuance. A total of 39,575 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercise, resulting in a net issuance of 7,935 shares to, and held by, Mr. Farber."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option, representing the right to purchase a total of 47,510 shares, vested 1/3 on each  of 02/27/19, 02/27/20, and 02/27/21."}],"balance_after":0,"derivative":{"exercise_price":104.11,"expiration_date":"2028-02-27","underlying":"Common Stock","underlying_shares":47510},"source":{"system":"sec-edgar","filing":"0001062993-22-012905","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322012905/form4.xml","form_type":"4"}},{"id":2266494,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-05-18T20:12:55.000Z","date":"2022-05-17","kind":"tax_withholding","acquired":false,"shares":39575,"price":148.76,"value":5887177.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Mr. Farber \"net exercised\" 47,510 options. The options were granted to Mr. Farber in 2018, and were scheduled to expire ten years after issuance. A total of 39,575 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercise, resulting in a net issuance of 7,935 shares to, and held by, Mr. Farber."}],"balance_after":78060.175,"source":{"system":"sec-edgar","filing":"0001062993-22-012905","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322012905/form4.xml","form_type":"4"}},{"id":2266493,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-05-18T20:12:55.000Z","date":"2022-05-17","kind":"exercise","acquired":true,"shares":47510,"price":104.11,"value":4946266.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Mr. Farber \"net exercised\" 47,510 options. The options were granted to Mr. Farber in 2018, and were scheduled to expire ten years after issuance. A total of 39,575 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercise, resulting in a net issuance of 7,935 shares to, and held by, Mr. Farber."}],"balance_after":117635.175,"source":{"system":"sec-edgar","filing":"0001062993-22-012905","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322012905/form4.xml","form_type":"4"}},{"id":2315856,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-03-29T21:43:51.000Z","date":"2022-03-25","kind":"grant","acquired":true,"shares":49.711,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Grant of restricted stock units under the Issuer's 2014 Long-Term Incentive Plan upon the accrual of dividend rights associated with restricted stock units previously granted by the Issuer. Such units vest on the third anniversary of the date of grant of the underlying restricted stock units."}],"balance_after":70125.175,"source":{"system":"sec-edgar","filing":"0001062993-22-008921","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322008921/form4.xml","form_type":"4"}},{"id":2323573,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock Option  (right to buy)","published_at":"2022-03-21T20:18:51.000Z","date":"2022-03-18","kind":"exercise","acquired":false,"shares":54569,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Mr. Farber \"net exercised\" 54,569, options effected pursuant to a pre-established Rule 10b5-1 Trading Plan. The options were granted to Mr. Farber in 2017, and were scheduled to expire ten years after issuance. A total of 42,155 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercise, resulting in a net issuance of 12,414 shares to, and held by, Mr. Farber."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The option, representing the right to purchase a total of 54,569 shares, vested 1/3 on each  of 02/24/18, 02/24/19 and 02/24/20."}],"balance_after":0,"derivative":{"exercise_price":85.87,"expiration_date":"2027-02-24","underlying":"Common stock","underlying_shares":54569},"source":{"system":"sec-edgar","filing":"0001062993-22-008203","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322008203/form4.xml","form_type":"4"}},{"id":2323572,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock Option (right to buy)","published_at":"2022-03-21T20:18:51.000Z","date":"2022-03-18","kind":"exercise","acquired":false,"shares":50453,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Mr. Farber \"net exercised\" 50,453 options effected pursuant to a pre-established  Rule 10b5-1 Trading Plan. The options were granted to Mr. Farber in 2016, and were scheduled to expire ten years after issuance. A total of 36,006 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercise, resulting in a net issuance of 14,447 shares to, and held by, Mr. Farber."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The option, representing the right to purchase a total of 50,453 shares, vested 1/3 on each  of 10/03/17, 10/03/18 and 10/03/19."}],"balance_after":0,"derivative":{"exercise_price":70.51,"expiration_date":"2026-10-03","underlying":"Common Stock","underlying_shares":50453},"source":{"system":"sec-edgar","filing":"0001062993-22-008203","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322008203/form4.xml","form_type":"4"}},{"id":2323571,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-03-21T20:18:51.000Z","date":"2022-03-18","kind":"tax_withholding","acquired":false,"shares":42155,"price":145.25,"value":6123013.75,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Mr. Farber \"net exercised\" 54,569, options effected pursuant to a pre-established Rule 10b5-1 Trading Plan. The options were granted to Mr. Farber in 2017, and were scheduled to expire ten years after issuance. A total of 42,155 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercise, resulting in a net issuance of 12,414 shares to, and held by, Mr. Farber."}],"balance_after":70075.464,"source":{"system":"sec-edgar","filing":"0001062993-22-008203","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322008203/form4.xml","form_type":"4"}},{"id":2323570,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-03-21T20:18:51.000Z","date":"2022-03-18","kind":"exercise","acquired":true,"shares":54569,"price":85.87,"value":4685840.03,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Mr. Farber \"net exercised\" 54,569, options effected pursuant to a pre-established Rule 10b5-1 Trading Plan. The options were granted to Mr. Farber in 2017, and were scheduled to expire ten years after issuance. A total of 42,155 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercise, resulting in a net issuance of 12,414 shares to, and held by, Mr. Farber."}],"balance_after":112230.464,"source":{"system":"sec-edgar","filing":"0001062993-22-008203","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322008203/form4.xml","form_type":"4"}},{"id":2323569,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-03-21T20:18:51.000Z","date":"2022-03-18","kind":"tax_withholding","acquired":false,"shares":36006,"price":145.25,"value":5229871.5,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Mr. Farber \"net exercised\" 50,453 options effected pursuant to a pre-established  Rule 10b5-1 Trading Plan. The options were granted to Mr. Farber in 2016, and were scheduled to expire ten years after issuance. 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The options were granted to Mr. Farber in 2016, and were scheduled to expire ten years after issuance. A total of 36,006 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercise, resulting in a net issuance of 14,447 shares to, and held by, Mr. Farber."}],"balance_after":93667.464,"source":{"system":"sec-edgar","filing":"0001062993-22-008203","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322008203/form4.xml","form_type":"4"}},{"id":2342741,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2022-03-09T20:30:32.000Z","date":"2022-03-07","kind":"tax_withholding","acquired":false,"shares":4816,"price":139.52,"value":671928.32,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares that were forfeited to pay withholding taxes upon the vesting of restricted stock units that were previously granted by the Issuer and vested on March 7, 2022. 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These PBRSUs were subject to a performance-based vesting condition related to three-year relative total shareholder return and a time-based vesting condition and also provided for the accumulation of dividend equivalent rights. On February 28, 2022, the performance condition for this award was certified at 91.67% of the target award (as adjusted for accumulated dividend equivalent rights) for the number of shares indicated. 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These PBRSUs were subject to a performance-based vesting condition related to three-year average adjusted return on equity and a time-based vesting condition and also provided for the accumulation of dividend equivalent rights. On February 28, 2022, the performance condition for this award was certified at 146.4% of the target award (as adjusted for accumulated dividend equivalent rights) for the number of shares indicated. 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Such units vest on the third anniversary of the date of grant of the underlying restricted stock units."}],"balance_after":37813.673,"source":{"system":"sec-edgar","filing":"0001062993-22-000185","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299322000185/form4.xml","form_type":"4"}},{"id":2492443,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2021-11-30T21:19:45.000Z","date":"2021-11-30","kind":"purchase","acquired":true,"shares":3506,"price":123.842,"value":434190.052,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. The shares were purchased at multiple prices ranging from $123.55 to $124.34. The Reporting Person undertakes to provide THG, any security holder of THG, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above."}],"balance_after":37755.475,"source":{"system":"sec-edgar","filing":"0001062993-21-011790","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/944695/000106299321011790/form4.xml","form_type":"4"}},{"id":2492442,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":27594,"kind":"person","name":"FARBER JEFFREY M","position":1,"cik":"0001275634","reported_name":"FARBER JEFFREY M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Vice President"}}],"security":"Common Stock","published_at":"2021-11-30T21:19:45.000Z","date":"2021-11-30","kind":"purchase","acquired":true,"shares":1494,"price":123.0187,"value":183789.9378,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. The shares were purchased at multiple prices ranging from $122.51 to $123.375. The Reporting Person undertakes to provide The Hanover Insurance Group, Inc. 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