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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Components of inventories    
Finished goods $ 353.5 $ 338.2
Work in process 8.9 8.1
Raw materials and repair parts 188.8 182.6
Gross inventories 551.2 528.9
Excess of current cost over last-in, first-out cost (62.9) (65.6)
Total inventories, net $ 488.3 $ 463.3