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Investments (Troubled Debt Restructurings on Financing Receivables) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
number
Sep. 30, 2011
number
Number of Loans35
Pre-Restructuring Recorded Investment$ 2.0$ 4.5
Post-Restructuring Recorded Investment2.04.0
Retail [Member]
  
Number of Loans24
Pre-Restructuring Recorded Investment1.33.8
Post-Restructuring Recorded Investment1.33.3
Office [Member]
  
Number of Loans11
Pre-Restructuring Recorded Investment0.70.7
Post-Restructuring Recorded Investment$ 0.7$ 0.7