Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits
Beginning Balance	$ 1.8	$ 1.8
Additions for Tax Positions of Current Year	0.1	0.0
Additions for Tax Positions of Prior Years	0.1	0.1
Reductions for Tax Positions of Prior Years	0.0	(0.1)
Ending Balance	$ 2.0	$ 1.8