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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 958.0 $ 775.7
Repair and replacement parts 658.9 550.2
Work in process 195.6 109.0
Raw materials 625.4 581.2
Inventories, net $ 2,437.9 $ 2,016.1