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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 967.5 $ 775.7
Repair and replacement parts 628.5 550.2
Work in process 199.2 109.0
Raw materials 647.2 581.2
Inventories, net $ 2,442.4 $ 2,016.1