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Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment $ 12,992.5 $ 12,719.4
Drilling rigs and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 11,067.4 11,001.8
Other    
Property, Plant and Equipment [Line Items]    
Property and equipment 180.8 180.0
Work in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 1,744.3 $ 1,537.6