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Property and Equipment, Net Property and Equipment, Net (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Depreciation, amortization and depletion of property and equipment $ 877.4 $ 848.5 $ 843.6
Property, Plant and Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Depreciation, amortization and depletion of property and equipment $ 806.7 $ 778.4 $ 766.9