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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate (as percent) | 27.50% | 36.50% | 28.30% | 35.40% |
U.S. Federal statutory rate (as percent) |  |  | 21.00% |  |
Income Tax [Line Items] |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense (Benefit) |  |  | $ (1.8) |  |
Gross unrecognized tax benefits, including interest and penalties | $ 72.6 |  | $ 72.6 |  | $ 66.5
Minimum |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Expected annual effective income tax rate (as percent) |  |  | 27.00% |  |
Maximum |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Expected annual effective income tax rate (as percent) |  |  | 28.00% |  |

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