Financial Guaranty Insurance Contracts (Details 3) (USD $)	6 Months Ended
	Jun. 30, 2012		Dec. 31, 2011
Gross
Total	$ 5,583,380,000		$ 5,962,799,000
Ceded
Total	590,781,000		708,872,000
Net
Unearned Premiums, Net	4,992,600,000	[1]	5,253,900,000	[1]
Total net unearned premium reserve related to FG VIE	255,500,000		274,200,000
Net
Salvage and subrogation recoverable	376,760,000		367,718,000
Reduction in net present value of expected loss due to consolidating FG VIEs	196,800,000
Reduction in future scheduled amortization of deferred premium revenue due to consolidating FG VIEs	381,400,000
Financial Guaranty
Gross
Deferred premium revenue	5,698,600,000		6,046,300,000
Contra-paid	(123,100,000)		(92,200,000)
Total	5,575,500,000		5,954,100,000
Ceded
Deferred premium revenue	610,600,000		727,400,000
Contra-paid	(19,800,000)		(18,800,000)
Total	590,800,000		708,600,000
Net
Deferred premium revenue	5,088,000,000	[1]	5,318,900,000	[1]
Contra-paid	103,300,000	[1]	73,400,000	[1]
Unearned Premiums, Net	4,984,700,000	[1]	5,245,500,000	[1]
Scheduled Net Earned Premium
2012 (July 1 - September 30)	137,900,000
2012 (October 1 - December 31)	131,000,000
Subtotal 2012	268,900,000
2013	472,900,000
2014	434,700,000
2015	384,600,000
2016	349,100,000
2017-2021	1,325,700,000
2022-2026	834,500,000
2027-2031	505,600,000
After 2031	512,000,000
Total present value basis	5,088,000,000	[2],[3]
Discount	279,600,000
Total future value	5,367,600,000
Net Expected Loss to be Expensed
2012 (July 1 - September 30)	16,200,000
2012 (October 1 - December 31)	14,900,000
Subtotal 2012	31,100,000
2013	61,000,000
2014	48,600,000
2015	38,000,000
2016	33,700,000
2017-2021	142,100,000
2022-2026	78,500,000
2027-2031	39,500,000
After 2031	30,700,000
Total present value basis	503,200,000	[2],[3]
Discount	275,600,000
Total future value	778,800,000
Net
2012 (July 1 - September 30)	121,700,000
2012 (October 1 - December 31)	116,100,000
Subtotal 2012	237,800,000
2013	411,900,000
2014	386,100,000
2015	346,600,000
2016	315,400,000
2017-2021	1,183,600,000
2022-2026	756,000,000
2027-2031	466,100,000
After 2031	481,300,000
Total present value basis	4,584,800,000	[2],[3]
Discount	4,000,000
Total future value	4,588,800,000
Other
Gross
Total	7,900,000		8,700,000
Ceded
Total	0		300,000
Net
Unearned Premiums, Net	$ 7,900,000	[1]	$ 8,400,000	[1]

[1] Total net unearned premium reserve excludes $255.5 million and $274.2 million related to FG VIEs as of June 30, 2012 and December 31, 2011, respectively.

[2] Balances represent discounted amounts.

[3] Consolidation of FG VIEs resulted in reductions of $381.4 million in future scheduled net earned premium and $196.8 million in net expected loss to be expensed.