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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 66.5 $ 61.1
Work in process 24.8 20.7
Finished goods 71.1 65.3
Supplies and other 10.4 14.3
Total $ 172.8 $ 161.4