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INVENTORIES (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories Table
Inventories consisted of the following:
 
June 30,
2017
 
December 31,
2016
 
June 30,
2016
 
($ in millions)
Supplies
$
59.7

 
$
58.1

 
$
60.9

Raw materials
74.9

 
72.6

 
82.1

Work in process
133.7

 
110.7

 
102.8

Finished goods
445.8

 
424.9

 
423.4

 
714.1

 
666.3

 
669.2

LIFO reserve
(47.9
)
 
(35.9
)
 
(33.0
)
Inventories, net
$
666.2

 
$
630.4

 
$
636.2