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Financial Guaranty Insurance Contracts (Details 3) (USD $)
3 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Jun. 30, 2011
Dec. 31, 2009
Selected Information for Policies Paid in Installments       
Premiums receivable, net of ceding commissions payable$ 987,115,000$ 1,322,500,000$ 987,115,000$ 1,322,500,000$ 1,167,587,000 $ 1,399,200,000
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Less: (Paid) Recovered Losses(104,700,000)(206,700,000)293,600,000(623,700,000)   
Expected LAE for mitigating claim liabilities15,900,000 15,900,000 17,200,000  
Weighted-average risk free rate to discount expected loss to be paid, low end of range (as a percent)  0.00% 0.00%  
Weighted-average risk free rate to discount expected loss to be paid, high end of range (as a percent)  3.85% 5.34%  
Reserves for other runoff lines of business1,900,000 1,900,000 2,100,0002,100,000 
Public finance | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period66,200,00088,600,00088,900,000130,900,000130,900,000  
Economic Loss Development6,700,000400,000(6,800,000)(7,700,000)   
Less: (Paid) Recovered Losses(30,200,000)(22,900,000)(39,400,000)(57,100,000)   
Net Expected Loss to be Paid, at the end of the period42,700,00066,100,00042,700,00066,100,000   
Total first lien | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period599,200,000906,900,000909,900,000827,100,000827,100,000  
Economic Loss Development82,800,00044,000,000(5,200,000)204,200,000   
Less: (Paid) Recovered Losses(91,900,000)(69,100,000)(314,600,000)(149,500,000)   
Net Expected Loss to be Paid, at the end of the period590,100,000881,800,000590,100,000881,800,000   
U.S. RMBS | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period466,200,000532,200,000160,800,000819,800,000819,800,000  
Economic Loss Development122,200,00047,300,00029,300,000195,800,000   
Less: (Paid) Recovered Losses(117,300,000)(218,700,000)281,000,000(654,800,000)   
Net Expected Loss to be Paid, at the end of the period471,100,000360,800,000471,100,000360,800,000   
Prime first lien | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period3,200,000400,0001,400,000    
Economic Loss Development(800,000)500,0001,000,000900,000   
Net Expected Loss to be Paid, at the end of the period2,400,000900,0002,400,000900,000   
Alt-A first lien | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period167,600,000190,800,000184,400,000204,400,000204,400,000  
Economic Loss Development(3,100,000)8,700,00018,700,00024,100,000   
Less: (Paid) Recovered Losses(16,600,000)(14,100,000)(55,200,000)(43,100,000)   
Net Expected Loss to be Paid, at the end of the period147,900,000185,400,000147,900,000185,400,000   
Option ARM | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period266,900,000571,200,000523,700,000545,200,000545,200,000  
Economic Loss Development50,400,00027,700,000(38,000,000)102,800,000   
Less: (Paid) Recovered Losses(74,500,000)(54,300,000)(242,900,000)(103,400,000)   
Net Expected Loss to be Paid, at the end of the period242,800,000544,600,000242,800,000544,600,000   
Subprime | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period161,500,000144,500,000200,400,00077,500,00077,500,000  
Economic Loss Development36,300,0007,100,00013,100,00076,400,000   
Less: (Paid) Recovered Losses(800,000)(700,000)(16,500,000)(3,000,000)   
Net Expected Loss to be Paid, at the end of the period197,000,000150,900,000197,000,000150,900,000   
CES | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period(94,700,000)119,000,00056,600,000199,300,000199,300,000  
Economic Loss Development47,200,0005,100,000(62,400,000)(35,300,000)   
Less: (Paid) Recovered Losses(1,500,000)(20,100,000)(43,200,000)(60,000,000)   
Net Expected Loss to be Paid, at the end of the period(49,000,000)104,000,000(49,000,000)104,000,000   
HELOCs | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period(38,300,000)(493,700,000)(805,700,000)(206,600,000)(206,600,000)  
Economic Loss Development(7,800,000)(1,800,000)96,900,00026,900,000   
Less: (Paid) Recovered Losses(23,900,000)(129,500,000)638,800,000(445,300,000)   
Net Expected Loss to be Paid, at the end of the period(70,000,000)(625,000,000)(70,000,000)(625,000,000)   
Second lien | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period(133,000,000)(374,700,000)(749,100,000)(7,300,000)(7,300,000)  
Economic Loss Development39,400,0003,300,00034,500,000(8,400,000)   
Less: (Paid) Recovered Losses(25,400,000)(149,600,000)595,600,000(505,300,000)   
Net Expected Loss to be Paid, at the end of the period(119,000,000)(521,000,000)(119,000,000)(521,000,000)   
Other Structured finance. | Financial Guaranty
       
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period180,600,000146,100,000159,100,000115,700,000115,700,000  
Economic Loss Development83,700,00018,200,000108,200,00054,200,000   
Less: (Paid) Recovered Losses(4,700,000)(1,900,000)(7,700,000)(7,500,000)   
Net Expected Loss to be Paid, at the end of the period259,600,000162,400,000259,600,000162,400,000   
Financial Guaranty
       
Selected Information for Policies Paid in Installments       
Gross deferred premium revenue6,202,200,000 6,202,200,000 7,108,600,000  
Present Value of Net Expected Loss to be paid Roll Forward by Sector       
Net Expected Loss to be Paid, at the beginning of the period713,000,000766,900,000408,800,0001,066,400,0001,066,400,000  
Economic Loss Development212,600,00065,900,000130,700,000242,300,000   
Less: (Paid) Recovered Losses(152,200,000)(243,500,000)233,900,000(719,400,000)   
Net Expected Loss to be Paid, at the end of the period773,400,000589,300,000773,400,000589,300,000   
Policies Paid in Installments
       
Selected Information for Policies Paid in Installments       
Premiums receivable, net of ceding commissions payable987,100,000 987,100,000 1,167,600,000  
Gross deferred premium revenue$ 2,272,500,000 $ 2,272,500,000 $ 2,933,600,000  
Weighted-average risk-free rate used to discount premiums (as a percent)  3.60% 3.50%  
Weighted-average period of premiums receivable (in years)  10.0 10.1