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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Components of Inventories

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

 

 

 

September 30,

 

 

December 31,

 

 

 

2019

 

 

2018

 

Raw materials

 

$

280.2

 

 

$

307.8

 

Work in process

 

 

15.8

 

 

 

13.9

 

Finished goods

 

 

215.8

 

 

 

199.0

 

Supplies and materials

 

 

294.5

 

 

 

274.9

 

Inventories

 

$

806.3

 

 

$

795.6