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Inventories
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories are valued at the lower of cost (on a first-in, first-out basis) or market. Inventory balances were as follows:
($ in millions)
September 30,
2013
 
December 31,
2012
Finished goods
$
76.7

 
$
70.9

Work in process
28.1

 
23.6

Raw materials
71.9

 
67.7

 
$
176.7

 
$
162.2