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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventories [Abstract]    
Raw materials and supplies $ 105.9 $ 104.0
Work in process 27.6 22.9
Finished products 77.1 74.4
Inventory reserves (36.2) (36.2)
Inventories, net $ 174.4 $ 165.1