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Inventories (Tables)
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories were as follows (dollars in millions):
 
June 30,
2016
 
December 31,
2015
Raw materials
$
256.5

 
$
260.6

Work in process
11.9

 
14.2

Finished goods
182.2

 
189.7

Supplies and materials
220.7

 
212.3

Inventories
$
671.3

 
$
676.8