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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Income Tax Contingency [Line Items]          
Income tax expense (benefit) $ 22.2 $ (5.3) $ 37.3 $ (5.3)  
Forecast          
Income Tax Contingency [Line Items]          
Effective income tax rate reconciliation, percent         35.00%