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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets    
State net operating loss carryforwards $ 15.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal $ 29.3us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Deferred compensation 26.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 29.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Tax benefit of uncertain tax positions 16.0amg_DeferredTaxAssetsTaxBenefitOnUncertainTaxPositions 16.2amg_DeferredTaxAssetsTaxBenefitOnUncertainTaxPositions
Accrued expenses 19.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 17.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Foreign loss carryforwards 11.5us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 9.1us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Other 1.4us-gaap_DeferredTaxAssetsOther 0us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 90.5us-gaap_DeferredTaxAssetsGross 101.3us-gaap_DeferredTaxAssetsGross
Valuation allowance (18.4)us-gaap_DeferredTaxAssetsValuationAllowance (36.6)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowance 72.1us-gaap_DeferredTaxAssetsNet 64.7us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities    
Intangible asset amortization (270.9)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (241.3)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Convertible securities interest (92.5)amg_DeferredTaxLiabilitiesConvertibleSecuritiesInterest (144.7)amg_DeferredTaxLiabilitiesConvertibleSecuritiesInterest
Non-deductible intangible amortization (126.4)amg_DeferredTaxLiabilitiesNondeductibleIntangibleAssetsAmortization (101.5)amg_DeferredTaxLiabilitiesNondeductibleIntangibleAssetsAmortization
Deferred revenue (74.0)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome (32.1)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Other 0us-gaap_DeferredTaxLiabilitiesOther (2.0)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (563.8)us-gaap_DeferredIncomeTaxLiabilities (521.6)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability $ (491.7)us-gaap_DeferredTaxLiabilities $ (456.9)us-gaap_DeferredTaxLiabilities