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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:

 (in Millions)September 30, 2020December 31, 2019
Finished goods$190.2 $372.2 
Work in process875.1 559.4 
Raw materials, supplies and other223.2 217.3 
First-in, first-out inventory$1,288.5 $1,148.9 
Less: Excess of first-in, first-out cost over last-in, first-out cost(133.0)(131.9)
Net inventories$1,155.5 $1,017.0