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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 65.3 $ 61.1
Work in process 23.2 20.7
Finished goods 83.5 65.3
Supplies and other 7.7 14.3
Inventories $ 179.7 $ 161.4