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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 (£)
Derivative
Notional amount	$ 21.9invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_PositionAxis = us-gaap_ShortMember	€ 28.0invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_PositionAxis = us-gaap_ShortMember	$ 34.3invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_PositionAxis = us-gaap_LongMember	£ 13.5invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_PositionAxis = us-gaap_LongMember

X

- 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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Period Type:	instant

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- Details

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