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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 (in Millions)
September 30, 2018
 
December 31, 2017
Finished goods
$
260.5

 
$
353.7

Work in process
609.4

 
542.4

Raw materials, supplies and other
256.2

 
224.1

First-in, first-out inventory
$
1,126.1

 
$
1,120.2

Less: Excess of first-in, first-out cost over last-in, first-out cost
(130.7
)
 
(127.7
)
Net inventories
$
995.4

 
$
992.5