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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories
 As of December 31,
 20212020
 (in millions)
Finished products$56.8 $69.4 
Work in process41.8 24.8 
Raw materials and supplies66.2 48.7 
164.8 142.9 
Reserve to reduce certain inventories to LIFO basis(4.8)(3.8)
Total inventories$160.0 $139.1