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Inventories, Net (Tables)
9 Months Ended
Sep. 30, 2022
Inventory Disclosure [Abstract]  
Inventories, Net

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December 31, 

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September 30, 

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2021

    

2022

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(In millions)

Raw materials:

 

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Chemicals

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$

76.3

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$

125.0

Component products

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5.0

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7.4

Total raw materials

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81.3

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132.4

Work in process:

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​

 

  

Chemicals

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30.4

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25.8

Component products

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16.8

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21.4

Total in-process products

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47.2

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47.2

Finished products:

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​

 

  

Chemicals

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246.4

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287.2

Component products

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3.8

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4.5

Total finished products

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250.2

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291.7

Supplies (chemicals)

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80.0

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74.5

Total

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$

458.7

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$

545.8