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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 54.0 $ 50.2
Work in process 23.8 22.4
Finished goods 67.4 69.9
Supplies and other 9.3 9.0
Total $ 154.5 $ 151.5