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Afilliate Equity - Schedule of the Effect of Changes in the Company's Ownership Interest in its Affiliates on the Controlling Interest's Equity (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Affiliate Equity [Abstract]                      
Net income (controlling interest) $ 172.6us-gaap_NetIncomeLoss $ 103.2us-gaap_NetIncomeLoss [1] $ 99.1us-gaap_NetIncomeLoss [1] $ 77.2us-gaap_NetIncomeLoss $ 158.2us-gaap_NetIncomeLoss $ 75.2us-gaap_NetIncomeLoss $ 64.7us-gaap_NetIncomeLoss $ 62.4us-gaap_NetIncomeLoss $ 452.1us-gaap_NetIncomeLoss $ 360.5us-gaap_NetIncomeLoss $ 174.0us-gaap_NetIncomeLoss
Increase (decrease) in controlling interest paid-in capital from the sale of Affiliate equity                 (33.3)amg_AdjustmentsToAdditionalPaidInCapitalIncreaseDecreaseInCarryingAmountOfRedeemableNoncontrollingInterests (74.0)amg_AdjustmentsToAdditionalPaidInCapitalIncreaseDecreaseInCarryingAmountOfRedeemableNoncontrollingInterests (44.0)amg_AdjustmentsToAdditionalPaidInCapitalIncreaseDecreaseInCarryingAmountOfRedeemableNoncontrollingInterests
Change from Net income (controlling interest) and net transfers with non-controlling interests                 $ 418.8amg_IncreaseDecreaseInEquityDueToProfitLossAndNetTransfersWithNoncontrollingInterests $ 286.5amg_IncreaseDecreaseInEquityDueToProfitLossAndNetTransfersWithNoncontrollingInterests $ 130.0amg_IncreaseDecreaseInEquityDueToProfitLossAndNetTransfersWithNoncontrollingInterests
[1] In the fourth quarter of 2014, the Company finalized its purchase price allocation for its investment in EIG. The final purchase price allocation resulted in a change in Income from equity method investments and Intangible-related deferred taxes in the second and third quarters of 2014. Income before taxes decreased $1.6 million and $1.7 million in the second and third quarters, respectively, Net income (controlling interest) decreased $1.0 million and $1.1 million in the second and third quarters, respectively, and Earnings per share (diluted) decreased $0.02 in both periods.