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Notes Payable (Scheduled Repayments On Outstanding Debt) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Total notes payable $ 2,510.5
Weighted Average Interest Rate 4.50%
Maturities Due In 2013 [Member]
 
2013 229.2
Weighted Average Interest Rate 5.40%
Maturities Due In 2014 [Member]
 
2014 35.4
Weighted Average Interest Rate 3.20%
Maturities Due In 2015 [Member]
 
2015 252.0
Weighted Average Interest Rate 5.10%
Maturities Due In 2016 [Member]
 
2016 2.3 [1]
Weighted Average Interest Rate 0.00% [1]
Maturities Due In 2017 [Member]
 
2017 249.2
Weighted Average Interest Rate 5.70%
Maturities Due Thereafter [Member]
 
Thereafter $ 1,742.4
Weighted Average Interest Rate 4.20%
[1] (1)Includes only scheduled principal amortizations.