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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 53.2 $ 50.2
Work in process 27.3 22.4
Finished goods 64.5 69.9
Supplies and other 9.2 9.0
Total $ 154.2 $ 151.5