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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 48.1 $ 50.4
Work in process 25.9 21.3
Finished goods 70.4 74.2
Supplies and other 9.3 9.3
Total $ 153.7 $ 155.2