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Derivative Financial Instruments - Schedule of Interest Rate Swap Agreements (Details) (Interest Rate Swap, USD $) In Millions, unless otherwise specified | Dec. 31, 2011
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Counterparty A Paying 1.67% Interest |
Derivative |
Notional amount | $ 25.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = amg_CounterpartyAPaying1.67PercentInterestMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Paying | 1.67%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = amg_CounterpartyAPaying1.67PercentInterestMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Counterparty A Paying 1.65% Interest |
Derivative |
Notional amount | 25.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = amg_CounterpartyAPaying1.65PercentInterestMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Paying | 1.65%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = amg_CounterpartyAPaying1.65PercentInterestMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Counterparty B Paying 1.59% Interest |
Derivative |
Notional amount | 25.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = amg_CounterpartyBPaying1.59PercentInterestMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Paying | 1.59%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = amg_CounterpartyBPaying1.59PercentInterestMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Counterparty B Paying 2.14% Interest |
Derivative |
Notional amount | $ 25.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = amg_CounterpartyBPaying2.14PercentInterestMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Paying | 2.14%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = amg_CounterpartyBPaying2.14PercentInterestMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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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
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration