Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Line Items]
Provision for income taxes	$ 22.7	$ 12.9
Effective tax rate (as a percent)	29.00%
Excess tax benefits related to employee stock compensation		$ 8.5
Effective tax rate excluding discrete benefits (as a percent)	30.50%	30.40%
Benefit from favorable tax return to provision adjustments and release of reserves for uncertain tax positions		$ 11.6
Accounting Standards Update No. 2016-09
Income Tax Disclosure [Line Items]
Excess tax benefits related to employee stock compensation	$ 1.2
Adjustment to retained earnings to recognize net operating loss carryforwards attributable to excess tax benefits on stock compensation	$ 0.4