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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Finished goods $ 705.8 $ 616.6
Repair and replacement parts 563.5 536.4
Work in process 135.9 130.5
Raw materials 411.1 467.2
Inventories, net $ 1,816.3 $ 1,750.7