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Inventories - Major Components of Inventory (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 118.4 $ 107.6
Work in process 15.3 14.5
Raw materials and supplies 76.5 64.3
Total inventory, net $ 210.2 $ 186.4