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Summary of Significant Accounting Policies - Income Taxes (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional income tax expense (benefit) | $ 173.5
Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense (benefit) | 42.5
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense (benefit) | $ 131.0

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