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Inventories, net (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventory, Net    
Raw materials $ 45.4 $ 41.0
Production materials, stores and supplies 11.7 11.3
Finished and in-process goods 121.8 118.6
Inventories valued at current costs 178.9 170.9
Less: excess of cost over LIFO cost (22.1) (19.9)
Inventories, net $ 156.8 $ 151.0