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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 50.2 $ 50.4
Work in process 22.4 21.3
Finished goods 69.9 74.2
Supplies and other 9.0 9.3
Total $ 151.5 $ 155.2