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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories were as follows (dollars in millions):
 
March 31,
2017
 
December 31,
2016
Raw materials
$
282.2

 
$
271.9

Work in process
13.7

 
12.9

Finished goods
212.8

 
206.5

Supplies and materials
235.8

 
232.3

Inventories
$
744.5

 
$
723.6