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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Components of Inventories

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

 

 

 

September 30,

 

 

December 31,

 

 

 

2018

 

 

2017

 

Raw materials

 

$

317.9

 

 

$

279.8

 

Work in process

 

 

14.9

 

 

 

12.6

 

Finished goods

 

 

180.4

 

 

 

217.0

 

Supplies and materials

 

 

267.4

 

 

 

253.1

 

Inventories

 

$

780.6

 

 

$

762.5