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Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Current Fiscal Year End Date --12-31  
Carrying Value $ 2,480.6 $ 2,724.7
Fixed Rate Notes Payable [Member]    
Carrying Value 2,274.9 2,273.3
Estimated Fair Value 2,347.0 2,358.8
Floating Rate Notes Payable [Member]    
Carrying Value 205.7 451.4
Estimated Fair Value $ 200.5 $ 441.3