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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 85.6 $ 80.5
Goods in process 4.3 3.3
Raw materials and supplies 35.0 32.4
Less LIFO reserves (8.0) (7.2)
Total inventories, net $ 116.9 $ 109.0