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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 85.6 $ 78.3
Raw materials 70.0 66.3
Work in process 13.4 12.7
Total inventories $ 169.0 $ 157.3