Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Information [Line Items]
U.S federal statutory rate	35.00%	35.00%
Discrete tax benefit realized on disqualifying dispositions of stock	$ 0.4	$ 0.6
Unrecognized tax benefits	20.8
Accrued interest and penalties related to uncertain tax positions	1.4		$ 1.4
Anticipated reduction in uncertain tax positions	1.3
Foreign Jurisdiction
Income Tax Information [Line Items]
Tax benefit due to lower statutory tax rates	$ 1.5	$ 5.4