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Inventories (Tables)
9 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories were as follows (dollars in millions):
 
September 30,
2015
 
December 31,
2014
Raw materials
$
271.5

 
$
261.9

Work in process
13.9

 
11.3

Finished goods
206.3

 
216.3

Supplies and materials
204.2

 
175.4

Inventories
$
695.9

 
$
664.9