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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Other Income Tax Expense [Line Items] |  |  |  |
Effective income tax rate | 14.30% | 11.10% | 17.60% | 13.80%
Release of valuation allowances |  |  | $ 10.8 |
Excess tax benefits | $ 2.2 |  | 6.9 |
Foreign rate changes |  |  |  |
Other Income Tax Expense [Line Items] |  |  |  |
Other tax expense |  |  | 14.8 |
Out-of-period adjustments |  |  |  |
Other Income Tax Expense [Line Items] |  |  |  |
Other tax expense |  |  | $ 5.1 |

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