Inventories - Summary of Inventories (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Inventories
Raw materials		$ 77.6	$ 89.2
Work in process		106.9	109.0
Finished goods		225.0	241.2
Total Inventories		409.5	439.4
Titled Inventory
Inventories
Raw materials		38.5	61.6
Work in process		68.7	72.3
Finished goods		155.0	162.1
Total Inventories		262.2	296.0
Supply & Offtake Agreements
Inventories
Raw materials	[1]	39.1	27.6
Work in process	[1]	38.2	36.7
Finished goods	[1]	70.0	79.1
Total Inventories	[1]	$ 147.3	$ 143.4

[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.