Income Tax Matters - Income Tax (Provision) Benefit by Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Domestic	$ (2.5)	$ 4.8	$ (7.0)	$ 2.0
Foreign	(0.5)	(0.7)	(0.9)	(1.2)
Total	$ (3.0)	$ 4.1	$ (7.9)	$ 0.8