Quarterly report pursuant to Section 13 or 15(d)

SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Inventories (Details)

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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished and semi-finished goods inventories $ 1,026.4 $ 114.1
Work-in-process 89.5 68.7
Raw materials 438.0 9.4
Total product inventories 1,553.9 192.2
Manufacturing supplies and critical spares 379.7 125.2
Inventories $ 1,933.6 $ 317.4