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The stock units vest in 25% increments on each of August 15, 2022, 2023, 2024 and 2025."}],"balance_after":836,"derivative":{"underlying":"Common Stock","underlying_shares":836},"source":{"system":"sec-edgar","filing":"0001127602-21-022610","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760221022610/form4.xml","form_type":"4"}},{"id":2725513,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":40910,"kind":"person","name":"Jeffery Reuben III","position":1,"cik":"0001492280","reported_name":"Jeffery Reuben III","relationship":{"director":true}}],"security":"Common Stock","published_at":"2021-05-06T12:29:20.000Z","date":"2021-05-04","kind":"purchase","acquired":true,"shares":2500,"price":160.49,"value":401225.0,"ownership":{"direct":true},"balance_after":20000,"source":{"system":"sec-edgar","filing":"0001127602-21-015609","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760221015609/form4.xml","form_type":"4"}},{"id":2867367,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":40910,"kind":"person","name":"Jeffery Reuben III","position":1,"cik":"0001492280","reported_name":"Jeffery Reuben III","relationship":{"director":true}}],"security":"Common Stock","published_at":"2021-02-11T13:29:40.000Z","date":"2021-02-10","kind":"purchase","acquired":true,"shares":2500,"price":145.53,"value":363825.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Reflects the price paid for shares purchased on the open market."}],"balance_after":17500,"source":{"system":"sec-edgar","filing":"0001127602-21-005101","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760221005101/form4.xml","form_type":"4"}},{"id":2872829,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":40910,"kind":"person","name":"Jeffery Reuben III","position":1,"cik":"0001492280","reported_name":"Jeffery Reuben III","relationship":{"director":true}}],"security":"Stock Units","published_at":"2021-02-09T21:49:29.000Z","date":"2021-02-08","kind":"grant","acquired":true,"shares":985,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in 25% increments on each of March 5, 2022, 2023, 2024 and 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in 25% increments on each of March 5, 2022, 2023, 2024 and 2025."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in 25% increments on each of March 5, 2022, 2023, 2024 and 2025."}],"balance_after":985,"derivative":{"underlying":"Common Stock","underlying_shares":985},"source":{"system":"sec-edgar","filing":"0001127602-21-004733","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760221004733/form4.xml","form_type":"4"}},{"id":2872828,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":40910,"kind":"person","name":"Jeffery Reuben III","position":1,"cik":"0001492280","reported_name":"Jeffery Reuben III","relationship":{"director":true}}],"security":"Director Stock Option (Right to Buy)","published_at":"2021-02-09T21:49:29.000Z","date":"2021-02-08","kind":"grant","acquired":true,"shares":636,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option is exercisable in 25% increments on each of March 5, 2022, 2023, 2024 and 2025."}],"balance_after":636,"derivative":{"exercise_price":132.1,"expiration_date":"2028-02-08","underlying":"Common Stock","underlying_shares":636},"source":{"system":"sec-edgar","filing":"0001127602-21-004733","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760221004733/form4.xml","form_type":"4"}},{"id":2998280,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":40910,"kind":"person","name":"Jeffery Reuben III","position":1,"cik":"0001492280","reported_name":"Jeffery Reuben III","relationship":{"director":true}}],"security":"Stock Units","published_at":"2020-10-29T21:01:17.000Z","date":"2020-10-27","kind":"grant","acquired":true,"shares":20,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in 25% increments on each of January 1, 2022, 2023, 2024 and 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in 25% increments on each of January 1, 2022, 2023, 2024 and 2025."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in 25% increments on each of January 1, 2022, 2023, 2024 and 2025."}],"balance_after":20,"derivative":{"underlying":"Common Stock","underlying_shares":20},"source":{"system":"sec-edgar","filing":"0001127602-20-027659","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760220027659/form4.xml","form_type":"4"}},{"id":3036773,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":40910,"kind":"person","name":"Jeffery Reuben III","position":1,"cik":"0001492280","reported_name":"Jeffery Reuben III","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-09-08T12:01:17.000Z","date":"2020-09-04","kind":"purchase","acquired":true,"shares":5000,"price":70.16,"value":350800.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reflects the weighted average price of shares purchased on the open market; the individual transaction prices ranged from $69.65 to $71.66. 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The stock units vest in 25% increments on each of August 15, 2021, 2022, 2023 and 2024."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Each stock unit represents a right to receive one share of the Company's common stock upon vesting.  The stock units vest in 25% increments on each of August 15, 2021, 2022, 2023 and 2024."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Each stock unit represents a right to receive one share of the Company's common stock upon vesting.  The stock units vest in 25% increments on each of August 15, 2021, 2022, 2023 and 2024."}],"balance_after":1990,"derivative":{"underlying":"Common Stock","underlying_shares":1990},"source":{"system":"sec-edgar","filing":"0001127602-20-022325","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760220022325/form4.xml","form_type":"4"}},{"id":3073616,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":40910,"kind":"person","name":"Jeffery Reuben III","position":1,"cik":"0001492280","reported_name":"Jeffery Reuben III","relationship":{"director":true}}],"security":"Director Stock Option (Right to Buy)","published_at":"2020-07-30T23:37:11.000Z","date":"2020-07-28","kind":"grant","acquired":true,"shares":3359,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"This option is exercisable in 25% increments on each of August 15, 2021, 2022, 2023 and 2024."}],"balance_after":3359,"derivative":{"exercise_price":69.63,"expiration_date":"2027-07-28","underlying":"Common Stock","underlying_shares":3359},"source":{"system":"sec-edgar","filing":"0001127602-20-022325","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760220022325/form4.xml","form_type":"4"}},{"id":3164207,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":40910,"kind":"person","name":"Jeffery Reuben III","position":1,"cik":"0001492280","reported_name":"Jeffery Reuben III","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-05-04T20:44:27.000Z","date":"2020-05-01","kind":"purchase","acquired":true,"shares":10000,"price":65.21,"value":652100.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reflects the weighted average price of shares purchased on the open market; the individual transaction prices ranged from $65.13 to $65.48. 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