Income Tax Matters - Income Tax Provision by Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Domestic	$ (2.8)	$ 0.1	$ (10.1)	$ (6.9)
Foreign	(0.6)	(0.2)	(1.6)	(1.1)
Total	$ (3.4)	$ (0.1)	$ (11.7)	$ (8.0)