Inventories - Summary of Inventories (Details) - USD ($) $ in Millions		Jun. 30, 2025	Dec. 31, 2024
Inventories
Raw materials		$ 78.6	$ 75.0
Work in process		98.7	97.5
Finished goods		193.2	243.8
Total Inventories		370.5	416.3
Titled Inventory
Inventories
Raw materials		52.1	45.3
Work in process		79.9	63.8
Finished goods		156.8	160.3
Total Inventories		288.8	269.4
Supply & Offtake Agreements
Inventories
Raw materials	[1]	26.5	29.7
Work in process	[1]	18.8	33.7
Finished goods	[1]	36.4	83.5
Total Inventories	[1]	$ 81.7	$ 146.9

[1] Amounts represent LIFO value and do not necessarily represent the value at which the inventory was sold. Please read Note 7 — “Inventory Financing Agreements” for further information.