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Fair Value Measurement (Details 3) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Assets:  
Short-term investments$ 1,105,615,000$ 1,055,567,000
Other invested assets252,082,000283,032,000
Credit derivative assets603,867,000592,898,000
FG VIEs' assets, at fair value3,492,204,0003,657,481,000
Liabilities:  
Credit derivative liabilities2,791,473,0002,462,831,000
FG VIEs' liabilities with recourse, at fair value2,848,897,0003,030,908,000
FG VIEs' liabilities without recourse, at fair value1,282,463,0001,337,214,000
Carrying Amount
  
Assets:  
Fixed maturity securities9,864,200,0009,402,300,000
Short-term investments1,105,600,0001,055,600,000
Other invested assets252,800,000259,800,000
Credit derivative assets603,900,000592,900,000
FG VIEs' assets, at fair value3,492,200,0003,657,500,000
Other assets49,300,00044,400,000
Liabilities:  
Financial guaranty insurance contracts4,843,400,0004,777,600,000
Long-term debt1,046,400,0001,052,900,000
Credit derivative liabilities2,791,400,0002,462,800,000
FG VIEs' liabilities with recourse, at fair value2,848,900,0003,030,900,000
FG VIEs' liabilities without recourse, at fair value1,282,500,0001,337,200,000
Estimated Fair Value
  
Assets:  
Fixed maturity securities9,864,200,0009,402,300,000
Short-term investments1,105,600,0001,055,600,000
Other invested assets263,600,000269,700,000
Credit derivative assets603,900,000592,900,000
FG VIEs' assets, at fair value3,492,200,0003,657,500,000
Other assets49,300,00044,400,000
Liabilities:  
Financial guaranty insurance contracts4,027,000,0005,582,800,000
Long-term debt1,163,900,0001,074,500,000
Credit derivative liabilities2,791,400,0002,462,800,000
FG VIEs' liabilities with recourse, at fair value2,848,900,0003,030,900,000
FG VIEs' liabilities without recourse, at fair value$ 1,282,500,000$ 1,337,200,000