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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Components of inventories    
Finished goods $ 403.2 $ 338.2
Work in process 9.2 8.1
Raw materials and repair parts 194.4 182.6
Gross inventories 606.8 528.9
Excess of current cost over last-in, first-out cost (66.1) (65.6)
Total inventories, net $ 540.7 $ 463.3