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Inventories
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following:
December 31,
 (in Millions)20202019
Finished goods$434.6 $372.2 
Work in process621.9 559.4 
Raw materials, supplies and other165.7 217.3 
FIFO inventory$1,222.2 $1,148.9 
Less: Excess of FIFO cost over LIFO cost(126.6)(131.9)
Net inventories$1,095.6 $1,017.0 

Approximately 33 percent and 21 percent of our inventories in 2020 and 2019, respectively, were recorded on the LIFO basis.