Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefit that Would Not Impact Effective Tax Rate, Tax Position with Uncertain Timing of Deductibility	$ 3.0		$ 3.7
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0.9		$ 0.7
Income Taxes Paid, Net	$ 0.0	$ 4.6