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Inventories
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following:
 (in Millions)September 30, 2021December 31, 2020
Finished goods$494.5 $434.6 
Work in process869.5 621.9 
Raw materials, supplies and other209.3 165.7 
First-in, first-out inventory$1,573.3 $1,222.2 
Less: Excess of first-in, first-out cost over last-in, first-out cost(122.8)(126.6)
Net inventories$1,450.5 $1,095.6