Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefit that Would Not Impact Effective Tax Rate, Tax Position with Uncertain Timing of Deductibility	$ 6.3		$ 4.6
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0.6		$ 0.5
Proceeds from Income Tax Refunds	$ 0.9
Income Taxes Paid, Net		$ 0.3