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Fair Value Disclosures (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Carrying Value $ 2,393.7 $ 2,432.1
Fixed Rate Notes Payable [Member]
   
Carrying Value 2,115.2 2,186.6
Estimated Fair Value 2,351.5 2,304.4
Floating Rate Notes Payable [Member]
   
Carrying Value 278.5 [1] 245.5 [1]
Estimated Fair Value $ 269.8 [1] $ 233.6 [1]
[1] Includes balances outstanding under our unsecured line of credit.