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Fair Value Measurement (Details 3) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Assets:  
Short-term investments$ 873,268,000$ 1,055,567,000
Other invested assets297,975,000283,032,000
Credit derivative assets467,252,000592,898,000
FG VIEs' assets, at fair value3,005,380,0003,657,481,000
Liabilities:  
Credit derivative liabilities1,495,312,0002,462,831,000
FG VIEs' liabilities with recourse, at fair value2,575,548,0003,030,908,000
FG VIEs' liabilities without recourse, at fair value1,133,025,0001,337,214,000
Carrying Amount
  
Assets:  
Fixed maturity securities10,091,200,0009,402,300,000
Short-term investments873,300,0001,055,600,000
Other invested assets238,600,000259,800,000
Credit derivative assets467,200,000592,900,000
FG VIEs' assets, at fair value3,005,400,0003,657,500,000
Other assets47,700,00044,400,000
Liabilities:  
Financial guaranty insurance contracts4,813,400,0004,777,600,000
Long-term debt1,041,700,0001,052,900,000
Credit derivative liabilities1,495,300,0002,462,800,000
FG VIEs' liabilities with recourse, at fair value2,575,600,0003,030,900,000
FG VIEs' liabilities without recourse, at fair value1,133,000,0001,337,200,000
Estimated Fair Value
  
Assets:  
Fixed maturity securities10,091,200,0009,402,300,000
Short-term investments873,300,0001,055,600,000
Other invested assets248,300,000269,700,000
Credit derivative assets467,200,000592,900,000
FG VIEs' assets, at fair value3,005,400,0003,657,500,000
Other assets47,700,00044,400,000
Liabilities:  
Financial guaranty insurance contracts4,259,800,0005,582,800,000
Long-term debt1,079,600,0001,074,500,000
Credit derivative liabilities1,495,300,0002,462,800,000
FG VIEs' liabilities with recourse, at fair value2,575,600,0003,030,900,000
FG VIEs' liabilities without recourse, at fair value$ 1,133,000,000$ 1,337,200,000