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Inventories
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following:

 (in Millions)March 31, 2021December 31, 2020
Finished goods$453.5 $434.6 
Work in process742.7 621.9 
Raw materials, supplies and other183.8 165.7 
First-in, first-out inventory$1,380.0 $1,222.2 
Less: Excess of first-in, first-out cost over last-in, first-out cost(125.3)(126.6)
Net inventories$1,254.7 $1,095.6