Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Net unrecognized tax benefit	$ 56.3		$ 54.6
Income tax interest and penalties accrued	1.2
Deferred tax assets	$ 202.9
Effective tax rate	18.60%	18.90%
U.S. federal statutory rate	35.00%