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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 106.5 $ 65.3
Work in process 38.5 23.2
Finished goods 93.6 83.5
Supplies and other 8.4 7.7
Total $ 247.0 $ 179.7