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Fair Value Disclosures (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Carrying Value $ 2,510.5  
Fixed Rate Notes Payable [Member]
   
Carrying Value 2,297.8 2,186.6
Estimated Fair Value 2,518.1 2,304.4
Floating Rate Notes Payable [Member]
   
Carrying Value 212.7 245.5
Estimated Fair Value $ 203.4 $ 233.6