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Fair Value Disclosures (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Carrying Value $ 2,483.6 $ 2,510.5
Fixed Rate Notes Payable [Member]
   
Carrying Value 2,271.2 2,297.8
Estimated Fair Value 2,483.0 2,518.1
Floating Rate Notes Payable [Member]
   
Carrying Value 212.4 212.7
Estimated Fair Value $ 203.3 $ 203.4