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Inventories - Schedule of Components of Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Inventories, net:    
Manufacturing supplies $ 42.3 $ 41.9
Raw materials 148.8 145.6
Work in process 502.4 496.1
Finished products 618.4 619.2
Subtotal 1,311.9 1,302.8
Allowance for obsolete and surplus inventory (80.7) (73.7)
Total inventories, net $ 1,231.2 $ 1,229.1