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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":2342,"derivative":{"underlying":"Common Stock","underlying_shares":2342},"source":{"system":"sec-edgar","filing":"0001127602-20-022344","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760220022344/form4.xml","form_type":"4"}},{"id":3073624,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":147544,"kind":"person","name":"Byrne Samuel T","position":1,"cik":"0001474915","reported_name":"Byrne Samuel T","relationship":{"director":true}}],"security":"Director Stock Option (Right to Buy)","published_at":"2020-07-31T00:08:38.000Z","date":"2020-07-28","kind":"grant","acquired":true,"shares":2239,"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":2239,"derivative":{"exercise_price":69.63,"expiration_date":"2027-07-28","underlying":"Common Stock","underlying_shares":2239},"source":{"system":"sec-edgar","filing":"0001127602-20-022344","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760220022344/form4.xml","form_type":"4"}},{"id":3247056,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":147544,"kind":"person","name":"Byrne Samuel T","position":1,"cik":"0001474915","reported_name":"Byrne Samuel T","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-02-26T13:21:46.000Z","date":"2020-02-25","kind":"purchase","acquired":true,"shares":946,"price":85.26,"value":80655.96,"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. On February 24, 2020, the individual transaction prices ranged from $84.99 to $85.15, and on February 25, 2020, the individual transaction prices ranged from $85.12 to $85.30. Specific transaction details will be provided to the SEC upon request."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes nine shares of common stock acquired as a result of dividend accruals on previously vested restricted stock unit awards."}],"balance_after":28092,"source":{"system":"sec-edgar","filing":"0001127602-20-007835","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760220007835/form4.xml","form_type":"4"}},{"id":3247055,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":147544,"kind":"person","name":"Byrne Samuel T","position":1,"cik":"0001474915","reported_name":"Byrne Samuel T","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-02-26T13:21:46.000Z","date":"2020-02-24","kind":"purchase","acquired":true,"shares":4054,"price":85.1,"value":344995.4,"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. On February 24, 2020, the individual transaction prices ranged from $84.99 to $85.15, and on February 25, 2020, the individual transaction prices ranged from $85.12 to $85.30. Specific transaction details will be provided to the SEC upon request."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes nine shares of common stock acquired as a result of dividend accruals on previously vested restricted stock unit awards."}],"balance_after":27146,"source":{"system":"sec-edgar","filing":"0001127602-20-007835","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1004434/000112760220007835/form4.xml","form_type":"4"}},{"id":3287116,"issuer":{"id":3556,"kind":"organization","name":"AFFILIATED MANAGERS GROUP, INC.","symbol":"AMG"},"owners":[{"id":147544,"kind":"person","name":"Byrne Samuel T","position":1,"cik":"0001474915","reported_name":"Byrne Samuel T","relationship":{"director":true}}],"security":"Stock Units","published_at":"2020-02-06T22:48:45.000Z","date":"2020-02-04","kind":"grant","acquired":true,"shares":488,"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.  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