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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax rate at which the deferred tax assets and liabilities are expected to reverse |  |  |  |  | 21.00%
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense |  |  |  |  | $ 41.1
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional tax |  |  | $ 290.0 |  |
Effective income tax rate, percent | 30.60% | 41.10% | 114.50% | 86.20% |
Increase in effective foreign income tax rate |  |  | 2.50% |  |

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