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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 113.8 $ 65.3
Work in process 43.4 23.2
Finished goods 95.7 83.5
Supplies and other 8.4 7.7
Total $ 261.3 $ 179.7