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Inventories
3 Months Ended
Mar. 31, 2014
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)
March 31,
2014
 
December 31,
2013
Finished goods
$
82.9

 
$
80.0

Work in process
29.0

 
24.8

Raw materials
75.6

 
72.1

 
$
187.5

 
$
176.9