Income Tax Matters - Schedule of (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Domestic	$ (0.9)	$ 8.5	$ 9.6	$ 24.7
Foreign	0.2	0.2	0.6	1.1
Total	$ (0.7)	$ 8.7	$ 10.2	$ 25.8