Income Tax Matters - Income Tax (Provision) Benefit - (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Domestic	$ (1.0)	$ (8.8)	$ 0.9	$ 8.5
Foreign	(0.1)	0.4	(1.2)	(1.1)
Total	$ (1.1)	$ (8.4)	$ (0.3)	$ 7.4