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INVENTORIES
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES
 
December 31,
 
2017
 
2016
 
($ in millions)
Supplies
$
66.1

 
$
58.1

Raw materials
75.3

 
72.6

Work in process
127.8

 
110.7

Finished goods
462.6

 
424.9

 
731.8

 
666.3

LIFO reserves
(49.2
)
 
(35.9
)
Inventories, net
$
682.6

 
$
630.4



Inventories valued using the LIFO method comprised 55% and 54% of the total inventories at December 31, 2017 and 2016, respectively.  The replacement cost of our inventories would have been approximately $49.2 million and $35.9 million higher than that reported at December 31, 2017 and 2016, respectively.