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Inventories
 12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following:
December 31,
 (in Millions)20192018
Finished goods$372.2  $430.4  
Work in process559.4  518.8  
Raw materials, supplies and other217.3  206.9  
FIFO inventory$1,148.9  $1,156.1  
Less: Excess of FIFO cost over LIFO cost(131.9) (130.6) 
Net inventories$1,017.0  $1,025.5  

Approximately 21 percent and 25 percent of our inventories in 2019 and 2018, respectively, were recorded on the LIFO basis.