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Affiliate Equity - Schedule of the Changes in Redeemable Non-controlling Interests (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Changes in redeemable non-controlling interests during the period    
Beginning balance $ 641.9us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 477.5us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Transactions in Redeemable non-controlling interests (61.7)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest (52.5)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Changes in redemption value 65.3amg_RedeemableNoncontrollingInterestChangeInRedemptionValue 216.9amg_RedeemableNoncontrollingInterestChangeInRedemptionValue
Ending balance $ 645.5us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 641.9us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount