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Inventories (Tables)
6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories are valued at the lower of standard cost (which approximates actual cost on a first-in-first-out basis) or market. Inventory balances were as follows:

($ in millions)
June 30,
2013
 
December 31,
2012
Finished goods
$
75.5

 
$
70.9

Work in process
28.8

 
23.6

Raw materials
72.2

 
67.7

 
$
176.5

 
$
162.2