Inventories - Summary of Inventories (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Inventories
Raw materials		$ 80.5	$ 75.0
Work in process		99.5	97.5
Finished goods		209.4	243.8
Total Inventories		389.4	416.3
Titled Inventory
Inventories
Raw materials		61.8	45.3
Work in process		72.4	63.8
Finished goods		165.2	160.3
Total Inventories		299.4	269.4
Supply & Offtake Agreements
Inventories
Raw materials	[1]	18.7	29.7
Work in process	[1]	27.1	33.7
Finished goods	[1]	44.2	83.5
Total Inventories	[1]	$ 90.0	$ 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.