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Derivatives Financial Instruments Derivative Financial Instruments - Schedule of Foreign Currency Forward Contracts (Details) | Mar. 31, 2015 Foreign Currency Forward Contract Other Assets USD ($) | Dec. 31, 2014 Foreign Currency Forward Contract Other Assets USD ($) | Mar. 31, 2015 Foreign Currency Forward Contract Other Liabilities USD ($) | Mar. 31, 2015 Foreign Exchange Forward Expected to Settle Quarterly Counterparty C Other Assets USD ($) | Dec. 31, 2014 Foreign Exchange Forward Expected to Settle Quarterly Counterparty C Other Assets USD ($) | Mar. 31, 2015 Foreign Exchange Forward Expected to Settle Quarterly Counterparty C Paying USD ($) | Mar. 31, 2015 Foreign Exchange Forward Expected to Settle Quarterly Counterparty C Receiving GBP (£) | Dec. 31, 2014 Foreign Exchange Forward Expected to Settle Monthly Counterparty C Other Assets USD ($) | Mar. 31, 2015 Foreign Exchange Forward Expected to Settle Monthly Counterparty C Other Liabilities USD ($) | Mar. 31, 2015 Foreign Exchange Forward Expected to Settle Monthly Counterparty C Paying EUR (€) | Mar. 31, 2015 Foreign Exchange Forward Expected to Settle Monthly Counterparty C Receiving USD ($)
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Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  | $ 21,000,000 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = amg_ForeignExchangeForwardExpectedtoSettleQuarterlyMember / us-gaap_PositionAxis = us-gaap_ShortMember | £ 25,700,000 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = amg_ForeignExchangeForwardExpectedtoSettleQuarterlyMember / us-gaap_PositionAxis = us-gaap_LongMember |  |  |  |  | € 11,300,000 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = amg_ForeignExchangeForwardExpectedtoSettleMonthlyMember / us-gaap_PositionAxis = us-gaap_ShortMember | $ 7,000,000 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = amg_ForeignExchangeForwardExpectedtoSettleMonthlyMember / us-gaap_PositionAxis = us-gaap_LongMember
Foreign currency forward liabilities at fair value |  |  |  |  |  |  | 3,200,000 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = amg_ForeignExchangeForwardExpectedtoSettleQuarterlyMember | [1] | 300,000 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = amg_ForeignExchangeForwardExpectedtoSettleQuarterlyMember | [2] |  |  | (800,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = amg_ForeignExchangeForwardExpectedtoSettleMonthlyMember | [2] | (900,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_CounterpartyNameAxis = amg_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = amg_ForeignExchangeForwardExpectedtoSettleMonthlyMember | [1] |  |
Derivative asset | 3,200,000 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | [2] | (500,000)us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability |  |  |  |  | $ 900,000 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | [2] |  |  |  |  |  |  |  |  |  |  |  |
[1] | Fair value of $3.2 million is presented within Other assets and $(0.9) million is presented within Other liabilities. These amounts are expected to be reclassified into earnings within the next twelve months.
[2] | Aggregate fair value of $(0.5) million is presented within Other assets.

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