Income Tax Matters - Income Tax Provision by Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Domestic	$ (0.2)	$ (2.5)	$ (7.2)	$ (7.0)
Foreign	(0.6)	(0.5)	(1.1)	(0.9)
Total	$ (0.8)	$ (3.0)	$ (8.3)	$ (7.9)