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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Components of Inventories

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

 

 

 

September 30,

 

 

December 31,

 

 

 

2021

 

 

2020

 

Raw materials

 

$

323.3

 

 

$

263.5

 

Work in process

 

 

16.1

 

 

 

11.6

 

Finished goods

 

 

190.6

 

 

 

183.6

 

Supplies and materials

 

 

350.1

 

 

 

329.2

 

Inventories

 

$

880.1

 

 

$

787.9