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Fair Value Disclosures (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Carrying Value $ 2,396.4 $ 2,432.1
Fixed Rate Notes Payable [Member]
   
Carrying Value 2,151.5 2,186.6
Estimated Fair Value 2,340.2 2,304.4
Floating Rate Notes Payable [Member]
   
Carrying Value 244.9 245.5
Estimated Fair Value $ 233.7 $ 233.6