Income Tax Matters - Income Tax Benefit (Provision) - (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Domestic	$ 4.8	$ 16.7	$ 2.0	$ 17.3
Foreign	(0.7)	(1.2)	(1.2)	(1.5)
Total	$ 4.1	$ 15.5	$ 0.8	$ 15.8