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Property and Equipment, Net (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Depreciation, amortization and depletion of property and equipment $ 991.1 $ 970.6 $ 906.9
Property, Plant and Equipment      
Property, Plant and Equipment [Line Items]      
Depreciation, amortization and depletion of property and equipment $ 919.8 $ 898.7 $ 838.5