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Derivative Financial Instruments Derivative Financial Instruments - Schedule of Foreign Currency Contracts (Details) (Counterparty C, Foreign Currency Forward Contract) In Millions, unless otherwise specified | Dec. 31, 2014 Paying USD ($) | Dec. 31, 2014 Paying EUR (€) | Dec. 31, 2014 Receiving USD ($) | Dec. 31, 2014 Receiving GBP (£)
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Derivative |  |  |  |
Notional amount | $ 21.9 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_PositionAxis = us-gaap_ShortMember | € 28.0 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_PositionAxis = us-gaap_ShortMember | $ 34.3 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_PositionAxis = us-gaap_LongMember | £ 13.5 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_PositionAxis = us-gaap_LongMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Details
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