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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Accrued compensation and distributions $ 491.3us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent $ 211.4us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent
Unsettled fund share payables 78.3amg_UnsettledFundSharePayables 84.6amg_UnsettledFundSharePayables
Accrued income taxes 59.8us-gaap_AccruedIncomeTaxes 73.0us-gaap_AccruedIncomeTaxes
Accrued share repurchases 47.8amg_PayablesRecordedForShareRepurchases 0amg_PayablesRecordedForShareRepurchases
Accrued professional fees 26.9us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent 33.4us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
Other 104.2us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent 112.3us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
Accounts payable and accrued liabilities $ 808.3us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent $ 514.7us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent