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Inventories - Schedule of Components of Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Inventories:    
Manufacturing supplies $ 41.9 $ 41.7
Raw materials 145.6 132.0
Work in process 496.1 491.2
Finished products 619.2 584.8
Subtotal 1,302.8 1,249.7
Allowance for surplus and obsolete inventory (73.7) (58.4)
Total Inventories, net $ 1,229.1 $ 1,191.3