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Inventories (Components of Inventory) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Components of inventory    
Raw materials and supplies $ 92.1 $ 92.6
Work in process 49.4 51.3
Finished goods 161.8 181.3
LIFO reserve 2.0 2.0
Inventories, net $ 305.3 $ 327.2