Income Taxes - Additional Information (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 [Line Items]
Provision for income taxes	$ 28.7	$ 27.0	$ 51.4	$ 39.9
Effective tax rate (as a percent)	30.50%	30.60%	29.80%
Excess tax benefits related to employee stock compensation				$ 8.6
Effective tax rate excluding discrete benefits (as a percent)			30.50%	30.60%
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		$ 0.4