Investments (Troubled Debt Restructurings on Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012 NumberOfLoans	Sep. 30, 2012 NumberOfLoans
Number of Loans	3	11
Pre-Restructuring Recorded Investment	$ 2.6	$ 10.2
Post-Restructuring Recorded Investment	3.9	11.4
Retail [Member]
Number of Loans	3	7
Pre-Restructuring Recorded Investment	2.6	6.0
Post-Restructuring Recorded Investment	3.9	7.2
Industrial [Member]
Number of Loans	0	3
Pre-Restructuring Recorded Investment	0	2.4
Post-Restructuring Recorded Investment	0	2.4
Apartment and Other [Member]
Number of Loans	0	1
Pre-Restructuring Recorded Investment	0	1.8
Post-Restructuring Recorded Investment	$ 0	$ 1.8