Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Line Items]
Provision for income taxes	$ 16.1	$ 20.7	$ 67.5	$ 60.6
Benefit from favorable tax return to provision adjustments and release of reserves for uncertain tax positions	$ 6.6			$ 11.6
Effective tax rate excluding discrete benefits (as a percent)	27.20%	28.20%	30.50%	30.60%
Excess tax benefits related to employee stock compensation				$ 9.2
Accounting Standards Update No. 2016-09
Income Tax Disclosure [Line Items]
Excess tax benefits related to employee stock compensation	$ 1.2		$ 2.4
Adjustment to retained earnings to recognize net operating loss carryforwards attributable to excess tax benefits on stock compensation	$ 0.4		$ 0.4