Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income tax provision	$ 55.5	$ 47.1
Effective income tax rate, percent	34.80%	34.20%
Effective income tax rate, at federal statutory income tax rate, percent	35.00%	35.00%
Cash paid for taxes, net of refunds received	$ 5.2	$ 9.8