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

 (in Millions)June 30, 2020December 31, 2019
Finished goods$132.8  $372.2  
Work in process920.7  559.4  
Raw materials, supplies and other217.6  217.3  
First-in, first-out inventory$1,271.1  $1,148.9  
Less: Excess of first-in, first-out cost over last-in, first-out cost(132.6) (131.9) 
Net inventories$1,138.5  $1,017.0