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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 (in Millions)
June 30, 2019
 
December 31, 2018
Finished goods
$
418.0

 
$
430.4

Work in process
587.7

 
518.8

Raw materials, supplies and other
283.3

 
206.9

First-in, first-out inventory
$
1,289.0

 
$
1,156.1

Less: Excess of first-in, first-out cost over last-in, first-out cost
(135.6
)
 
(130.6
)
Net inventories
$
1,153.4

 
$
1,025.5