v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Accounting Policies [Abstract]      
Finished products $ 557.1 $ 557.7 $ 574.4
Raw materials 41.0 36.7 57.8
Products in process 7.0 5.4 10.9
Operating supplies and other 83.6 80.7 82.4
Total inventories $ 688.7 $ 680.5 $ 725.5