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Inventories (Components of Inventory) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Components of inventory    
Raw materials and supplies $ 106.1 $ 93.8
Work in process 40.7 42.3
Finished goods 186.6 174.8
Inventories, net $ 333.4 $ 310.9