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Inventories, Net (Components of Inventories) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished products $ 190.1 $ 203.3
Work in process 7.7 5.1
Raw materials and supplies 124.2 119.4
Inventories, net $ 322.0 $ 327.8