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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 48.9 $ 50.4
Work in process 23.1 21.3
Finished goods 71.3 74.2
Supplies and other 9.6 9.3
Total $ 152.9 $ 155.2