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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Accounting Policies [Abstract]      
Finished products $ 505.9 $ 494.4 $ 448.1
Raw materials 62.2 51.2 50.5
Products in process 11.1 6.5 8.6
Operating supplies and other 68.5 63.5 63.4
Total inventories $ 647.7 $ 615.6 $ 570.6