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Inventories, net (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory, Net    
Raw materials $ 41.4 $ 50.8
Production materials, stores and supplies 12.4 12.0
Finished and in-process goods 110.8 109.8
Subtotal 164.6 172.6
Less: excess of cost over LIFO cost (10.0) (21.4)
Inventories, net $ 154.6 $ 151.2