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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Provision |  |  |  |  |
Income tax benefit of indefinite reinvestment of earnings of foreign subsidiaries |  | $ 17.5 | $ 6.3 | $ 30.0 | $ 18.8
Controlling Interest |  |  |  |  |
Income Tax Provision |  |  |  |  |
Effective tax rate attributable to controlling interests | [1] | 31.90% | 34.00% | 32.80% | 34.80%
[1] | Taxes attributable to the controlling interest divided by Income before income taxes (controlling interest).

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- Definition Income Tax Expense (Benefit), Indefinite Reinvestment of Earnings of Foreign Subsidiaries + References No definition available. + Details
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- Definition A ratio calculated by dividing the amount of income tax expense attributable to the controlling interest by pretax income from continuing operations attributable to the controlling interest. + References No definition available. + Details
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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Namespace Prefix: | amg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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