Income Tax Matters - Income Tax (Provision) Benefit - (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Domestic	$ (2.9)	$ 0.6
Foreign	(0.4)	(0.3)
Total	$ (3.3)	$ 0.3