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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished and semi-finished goods inventories $ 940.5 $ 114.1
Work-in-process 78.2 68.7
Raw materials 382.3 9.4
Total product inventories 1,401.0 192.2
Manufacturing supplies and critical spares 394.1 125.2
Inventories $ 1,795.1 $ 317.4