Income Taxes - Schedule of Changes Affecting the Valuation Allowances on Deferred Tax Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation Allowance [Line Items]
Beginning Balance	$ 8.3
Ending Balance	10.7	$ 8.3
Valuation Allowance Deferred Tax Assets
Valuation Allowance [Line Items]
Beginning Balance	8.3	8.1	$ 7.1
Current year expense	2.4	0.2	1.0
Ending Balance	$ 10.7	$ 8.3	$ 8.1