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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Other Income Tax Expense [Line Items] |  |  |  |
Effective income tax rate | 19.00% | 22.40% | 20.00% | 14.80%
Release of valuation allowances |  |  | $ 9.8 |
Excess tax benefits | $ 0.6 |  | 4.7 |
Foreign rate changes |  |  |  |
Other Income Tax Expense [Line Items] |  |  |  |
Other tax expense |  |  | 13.1 |
Out-of-period adjustments |  |  |  |
Other Income Tax Expense [Line Items] |  |  |  |
Other tax expense |  |  | $ 5.1 |

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