Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Net unrecognized tax benefit	$ 65.8		$ 65.8		$ 54.6
Income tax interest and penalties accrued	2.2		2.2
Deferred tax assets	$ 229.5		$ 229.5
Effective tax rate	10.40%	(4.80%)	15.00%	5.80%
U.S. federal statutory rate			35.00%