Business Combinations, Deconsolidation of Subsidiary, and Disposal Groups Held for Sale (Details 2) (Mexican Acquisition Partnerships, USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Jul. 31, 2012 item	Dec. 31, 2011 item	Jun. 30, 2012
Mexican Acquisition Partnerships
Divesture - Portfolio Asset Acquisition & Resolution Business Segment
Number of partnerships expected to be sold or otherwise disposed of		3
Period over which subsidiaries expected to be sold or disposed of		12 months
Number of wholly-owned subsidiaries included in partnerships expected to be sold or otherwise disposed of		2
Portfolio assets classified as assets held-for-sale		$ 4.8	$ 4.9
Affiliated loan receivable classified as assets held-for-sale		5.1
Affiliated note payable classified as liabilities associated with assets held-for-sale		5.1
Number of subsidiaries sold	2
Proceeds from sale of interests in subsidiaries	5.5
Gain recognized on the transaction	1.3
Recognition of previously-deferred income	$ 0.5
Number of subsidiaries sold	1