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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate | 24.70% |  | 35.40% | 24.80% | 35.50%
Tax Act, provisional income tax benefit |  | $ 60.6 |  |  |
Undistributed earnings of certain foreign subsidiaries | $ 61.8 | $ 58.7 |  | $ 61.8 |

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