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Inventory
12 Months Ended
Dec. 31, 2022
Inventory Disclosure [Abstract]  
Inventory
5. Inventory

Inventory as of the periods indicated consisted of the following (in millions):
December 31,
20222021
Raw materials and consumables$15.7 $14.3 
Work in process1.2 1.2 
Finished goods2.0 1.5 
Total inventory$18.9 $17.0