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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Components of Inventories

The components of inventories were as follows (dollars in millions):

 

 

 

September 30,

 

 

December 31,

 

 

 

2017

 

 

2016

 

Raw materials

 

$

263.7

 

 

$

271.9

 

Work in process

 

 

13.0

 

 

 

12.9

 

Finished goods

 

 

214.5

 

 

 

206.5

 

Supplies and materials

 

 

245.4

 

 

 

232.3

 

Inventories

 

$

736.6

 

 

$

723.6