Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Contingency [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense			$ 1.8
Unrecognized tax benefit more likely than not percentage threshold	50.00%
Unrecognized tax benefits	$ 86.3
Unrecognized tax benefits that would impact effective tax rate	66.6
Interest expense or penalties, uncertain tax positions	0.1	$ 0.0
Accrued interest, uncertain tax positions	$ 0.8	$ 0.0	$ 0.7
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Earliest year subject to examination	2000