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Such RSUs vest on the third anniversary of the date of grant of the original underlying RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Does not include 14,454 shares held by the Reporting Person's spouse."}],"balance_after":141253.034,"source":{"system":"sec-edgar","filing":"0001193125-26-405374","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1428157/000119312526405374/ownership.xml","form_type":"4"}},{"id":723205,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":34598,"kind":"person","name":"Roche John C","position":1,"cik":"0001428157","reported_name":"Roche John C","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-06-30T20:10:08.000Z","date":"2026-06-26","kind":"grant","planned":false,"acquired":true,"shares":122.234,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Grant of restricted stock units (\"RSUs\") under the Issuer's 2022 Long-Term Incentive Plan (\"2022 LTIP\") in connection with the accrual of dividend equivalent rights associated with RSUs previously granted under the Issuer's 2022 LTIP. Such RSUs vest on the third anniversary of the date of grant of the original underlying RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Does not include 14,454 shares held by the Reporting Person's spouse."}],"balance_after":141132.982,"source":{"system":"sec-edgar","filing":"0001193125-26-290508","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/944695/000119312526290508/ownership.xml","form_type":"4"}},{"id":768823,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":34598,"kind":"person","name":"Roche John C","position":1,"cik":"0001428157","reported_name":"Roche John C","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock Option (right to buy)","published_at":"2026-05-21T20:26:17.000Z","date":"2026-05-19","kind":"exercise","planned":true,"acquired":false,"shares":24026,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The option, representing the right to purchase a total of 72,078 shares, vested 1/3 on each of 2/27/19, 2/27/20 and 2/27/21."}],"balance_after":48052,"derivative":{"exercise_price":104.11,"expiration_date":"2028-02-27","underlying":"Common Stock","underlying_shares":24026},"source":{"system":"sec-edgar","filing":"0001428157-26-000005","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/944695/000142815726000005/ownership.xml","form_type":"4"}},{"id":768822,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":34598,"kind":"person","name":"Roche John C","position":1,"cik":"0001428157","reported_name":"Roche John C","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock Option (right to buy)","published_at":"2026-05-21T20:26:17.000Z","date":"2026-05-19","kind":"exercise","planned":true,"acquired":false,"shares":9098,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The option, representing the right to purchase a total of 27,292 shares, vested 1/3 on each of 2/24/18, 2/24/19 and 2/24/20."}],"balance_after":0,"derivative":{"exercise_price":85.87,"expiration_date":"2027-02-24","underlying":"Common Stock","underlying_shares":9098},"source":{"system":"sec-edgar","filing":"0001428157-26-000005","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/944695/000142815726000005/ownership.xml","form_type":"4"}},{"id":768821,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":34598,"kind":"person","name":"Roche John C","position":1,"cik":"0001428157","reported_name":"Roche John C","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-05-21T20:26:17.000Z","date":"2026-05-20","kind":"sale","planned":true,"acquired":false,"shares":61,"price":194.77,"value":11880.97,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a pre-established Rule 10b5-1 Trading Plan, adopted on November 19, 2025, the Reporting Person's options were \"net exercised\". Accordingly, a total of 24,766 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercises, resulting in a net issuance of 8,358 shares, which were subsequently sold in accordance with the terms of the Rule 10b5-1 Trading Plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Does not include 14,454 shares held by the Reporting Person's spouse."}],"balance_after":141010.748,"source":{"system":"sec-edgar","filing":"0001428157-26-000005","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/944695/000142815726000005/ownership.xml","form_type":"4"}},{"id":768820,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":34598,"kind":"person","name":"Roche John C","position":1,"cik":"0001428157","reported_name":"Roche John C","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-05-21T20:26:17.000Z","date":"2026-05-20","kind":"sale","planned":true,"acquired":false,"shares":5145,"price":194.05,"value":998387.25,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a pre-established Rule 10b5-1 Trading Plan, adopted on November 19, 2025, the Reporting Person's options were \"net exercised\". Accordingly, a total of 24,766 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercises, resulting in a net issuance of 8,358 shares, which were subsequently sold in accordance with the terms of the Rule 10b5-1 Trading Plan."},{"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 $193.73 to $194.72. 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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Does not include 14,454 shares held by the Reporting Person's spouse."}],"balance_after":141071.748,"source":{"system":"sec-edgar","filing":"0001428157-26-000005","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/944695/000142815726000005/ownership.xml","form_type":"4"}},{"id":768819,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":34598,"kind":"person","name":"Roche John C","position":1,"cik":"0001428157","reported_name":"Roche John C","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-05-21T20:26:17.000Z","date":"2026-05-20","kind":"sale","planned":true,"acquired":false,"shares":3152,"price":193.21,"value":608997.92,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a pre-established Rule 10b5-1 Trading Plan, adopted on November 19, 2025, the Reporting Person's options were \"net exercised\". Accordingly, a total of 24,766 shares were withheld by the Company to satisfy the exercise price and taxes associated with the exercises, resulting in a net issuance of 8,358 shares, which were subsequently sold in accordance with the terms of the Rule 10b5-1 Trading Plan."},{"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 $192.70 to $193.69. The Reporting Person undertakes to provide The Hanover Insurance Group, Inc. 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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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Does not include 14,454 shares held by the Reporting Person's spouse."}],"balance_after":143626.748,"source":{"system":"sec-edgar","filing":"0001428157-26-000002","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/944695/000142815726000002/ownership.xml","form_type":"4"}},{"id":773215,"issuer":{"id":3652,"kind":"organization","name":"HANOVER INSURANCE GROUP, INC.","symbol":"THG"},"owners":[{"id":34598,"kind":"person","name":"Roche John C","position":1,"cik":"0001428157","reported_name":"Roche John C","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-05-19T20:32:57.000Z","date":"2026-05-18","kind":"sale","planned":true,"acquired":false,"shares":375,"price":196.55,"value":73706.25,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a pre-established Rule 10b5-1 Trading Plan, adopted on November 19, 2025, the Reporting Person's options were \"net exercised\". 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Accordingly, per the terms of the Agreement such options were \"net exercised\" on 2/27/25. 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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 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. 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