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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:

 (in Millions)March 31, 2020December 31, 2019
Finished goods$200.1  $372.2  
Work in process788.1  559.4  
Raw materials, supplies and other206.7  217.3  
First-in, first-out inventory$1,194.9  $1,148.9  
Less: Excess of first-in, first-out cost over last-in, first-out cost(132.2) (131.9) 
Net inventories$1,062.7  $1,017.0