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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of inventories by major class
The following schedule details inventories by major class ($ in millions):
 
June 30,
2015
 
December 31,
2014
Raw materials
$
33.1

 
$
35.1

Work in process
19.8

 
17.4

Finished goods
39.4

 
40.4

Supplies and other
13.8

 
15.5

Total
$
106.1

 
$
108.4