v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Accounting Policies [Abstract]      
Finished products $ 564.1 $ 557.7 $ 570.3
Raw materials 41.0 36.7 65.7
Products in process 6.7 5.4 10.3
Operating supplies and other 84.0 80.7 74.7
Total inventories $ 695.8 $ 680.5 $ 721.0