Income Tax Matters - Income Tax Provision by Region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Domestic	$ (6.6)	$ (5.0)
Foreign	(0.6)	(0.5)
Total	$ (7.2)	$ (5.5)	[1]

[1] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.