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Inventories, Net (Tables)
9 Months Ended
Sep. 30, 2023
Inventory Disclosure [Abstract]  
Inventories, Net

December 31, 

September 30, 

    

2022

    

2023

(In millions)

Raw materials:

 

  

 

  

Chemicals

$

145.3

$

132.6

Component products

 

6.2

 

5.6

Total raw materials

 

151.5

 

138.2

Work in process:

 

  

 

  

Chemicals

 

32.0

 

32.6

Component products

 

20.0

 

23.0

Total in-process products

 

52.0

 

55.6

Finished products:

 

  

 

  

Chemicals

 

350.7

 

247.0

Component products

 

5.1

 

5.7

Total finished products

 

355.8

 

252.7

Supplies (chemicals)

 

81.5

 

86.4

Total

$

640.8

$

532.9