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Inventories (Tables)
3 Months Ended
Mar. 31, 2025
Inventory Disclosure [Abstract]  
Components of Inventories

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

 

 

 

March 31,

 

 

December 31,

 

 

 

2025

 

 

2024

 

Raw materials

 

$

368.9

 

 

$

356.6

 

Work in process

 

 

15.6

 

 

 

15.5

 

Finished goods

 

 

229.9

 

 

 

234.0

 

Supplies and materials

 

 

526.2

 

 

 

518.8

 

Inventories

 

$

1,140.6

 

 

$

1,124.9