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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 73.7 $ 74.3
Raw materials 61.7 52.6
Work in process 12.3 10.3
Total inventories $ 147.7 $ 137.2