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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 65.2 $ 65.3
Work in process 24.6 23.2
Finished goods 75.5 83.5
Supplies and other 8.0 7.7
Total $ 173.3 $ 179.7