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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following:
 
December 31,
 (in Millions)
2018
 
2017
Finished goods
$
430.4

 
$
349.6

Work in process
518.8

 
508.1

Raw materials, supplies and other
206.9

 
211.9

FIFO inventory
$
1,156.1

 
$
1,069.6

Less: Excess of FIFO cost over LIFO cost
(130.6
)
 
(126.8
)
Net inventories
$
1,025.5

 
$
942.8