Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 item	Sep. 30, 2011 item	Dec. 31, 2011
Nature of Operations
Number of major business segments	2	2
Number of minimum co-investors forming investment entities	1
Portfolio Assets
Carrying value of purchased credit-impaired loans accounted for under the cost-recovery method	$ 24.2		$ 27.9
Carrying value of purchased credit-impaired loans accounted for under the cost-recovery method, pending management's post-purchase evaluation	3.6
Carrying value of purchased credit-impaired loans accounted for under the cash basis method	25.3		53.8
Unconsolidated Subsidiaries
Financial Policies of subsidiaries including certain entities ownership	20.00%
Correction for overstatement | Adjustment
Out-of-period adjustments
Foreign current income tax liability		0.7