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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]        
Income tax expense $ (54.5) $ (70.0) $ (70.5) $ (116.1)
Effective income tax rate reconciliation, percent 27.90% 37.30% 26.20% 37.30%
Effective income tax rate reconciliation, share-based compensation, excess tax benefit, amount $ 19.0   $ 30.0