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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Income tax provision $ 61.8 $ 61.4 $ 117.3 $ 108.5
Effective income tax rate, percent 34.80% 35.00% 34.80% 34.60%
Effective income tax rate, at federal statutory income tax rate, percent 35.00% 35.00% 35.00%  
Cash paid for taxes, net of refunds received     $ 83.3 $ 87.8