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Summary of Significant Accounting Policies - Income Taxes (Details)
$ in Millions
 12 Months Ended
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