Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Contingency [Line Items]
Income tax benefit	$ 15.5
Tax benefit related to prior years	12.5
Unrecognized tax benefit more likely than not percentage threshold		50.00%
Unrecognized tax benefits	90.0	$ 90.0
Unrecognized tax benefits that would impact effective tax rate	66.6	66.6
Interest expense or penalties, uncertain tax positions		0.5	$ 0.0
Accrued interest, uncertain tax positions	$ 0.5	$ 0.5	$ 0.0	$ 0.0
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Earliest year subject to examination		2000