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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 78.4 $ 74.3
Raw materials 62.3 52.6
Work in process 12.9 10.3
Total inventories $ 153.6 $ 137.2