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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 82.4 $ 77.6
Raw materials 51.8 35.3
Work in process 5.5 7.2
Total inventories $ 139.7 $ 120.1