Income Taxes - Schedule of a Reconciliation of the Provision for Income Taxes at the U.S. Federal Statutory Income Tax Rate to the Actual Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of provision for income taxes at U.S. federal statutory income tax rate to effective income tax rate
Provision for taxes at U.S. federal statutory rate	$ 111.4	$ 104.1	$ 91.9
State and local taxes, net of federal benefit	2.5	1.9	2.0
Foreign effective rate differential	(19.5)	(15.9)	(12.5)
Research and Development tax credits	(1.7)	(1.5)	(2.8)
Other	1.9	0.7	(2.6)
Release of reserves for uncertain tax positions	(11.6)
Total provision for income taxes	$ 83.0	$ 89.3	$ 76.0