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Fair Value Measurement (Details) (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
Fair value measurement on recurring basis
  
Assets:  
Total fixed maturity securities9,864,200,0009,402,300,000
Short-term investments1,105,600,0001,055,600,000
Other invested assets37,900,00033,300,000
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
Total assets carried at fair value15,153,100,00014,786,000,000
Liabilities:  
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
Other liabilities 100,000
Total liabilities carried at fair value6,922,800,0006,831,000,000
Fair value measurement on recurring basis | Level 1
  
Assets:  
Short-term investments164,800,000277,400,000
Other invested assets400,000200,000
Other assets29,500,00025,700,000
Total assets carried at fair value194,700,000303,300,000
Fair value measurement on recurring basis | Level 2
  
Assets:  
Total fixed maturity securities9,502,300,0009,092,700,000
Short-term investments940,800,000778,200,000
Other invested assets25,500,00021,400,000
Other assets19,800,00018,700,000
Total assets carried at fair value10,488,400,0009,911,000,000
Liabilities:  
Other liabilities 100,000
Total liabilities carried at fair value 100,000
Fair value measurement on recurring basis | Level 2 | U.S. government and agencies
  
Assets:  
Total fixed maturity securities975,300,0001,048,200,000
Fair value measurement on recurring basis | Level 2 | Obligations of state and political subdivisions
  
Assets:  
Total fixed maturity securities5,184,200,0004,959,900,000
Fair value measurement on recurring basis | Level 2 | Corporate securities
  
Assets:  
Total fixed maturity securities1,065,500,000992,500,000
Fair value measurement on recurring basis | Level 2 | RMBS
  
Assets:  
Total fixed maturity securities1,129,500,0001,071,700,000
Fair value measurement on recurring basis | Level 2 | CMBS
  
Assets:  
Total fixed maturity securities516,100,000379,100,000
Fair value measurement on recurring basis | Level 2 | Asset-backed securities
  
Assets:  
Total fixed maturity securities287,000,000292,700,000
Fair value measurement on recurring basis | Level 2 | Foreign government securities
  
Assets:  
Total fixed maturity securities344,700,000348,600,000
Fair value measurement on recurring basis | Level 3
  
Assets:  
Total fixed maturity securities361,900,000309,600,000
Other invested assets12,000,00011,700,000
Credit derivative assets603,900,000592,900,000
FG VIEs' assets, at fair value3,492,200,0003,657,500,000
Total assets carried at fair value4,470,000,0004,571,700,000
Liabilities:  
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
Total liabilities carried at fair value6,922,800,0006,830,900,000
Fair value measurement on recurring basis | Level 3 | RMBS
  
Assets:  
Total fixed maturity securities88,000,00099,400,000
Fair value measurement on recurring basis | Level 3 | Asset-backed securities
  
Assets:  
Total fixed maturity securities273,900,000210,200,000
Fair value measurement on recurring basis | U.S. government and agencies
  
Assets:  
Total fixed maturity securities975,300,0001,048,200,000
Fair value measurement on recurring basis | Obligations of state and political subdivisions
  
Assets:  
Total fixed maturity securities5,184,200,0004,959,900,000
Fair value measurement on recurring basis | Corporate securities
  
Assets:  
Total fixed maturity securities1,065,500,000992,500,000
Fair value measurement on recurring basis | RMBS
  
Assets:  
Total fixed maturity securities1,217,500,0001,171,100,000
Fair value measurement on recurring basis | CMBS
  
Assets:  
Total fixed maturity securities516,100,000379,100,000
Fair value measurement on recurring basis | Asset-backed securities
  
Assets:  
Total fixed maturity securities560,900,000502,900,000
Fair value measurement on recurring basis | Foreign government securities
  
Assets:  
Total fixed maturity securities344,700,000348,600,000
Fair value measurement on non-recurring basis | Level 3
  
Liabilities:  
Mortgage loans recorded at fair value$ 10,000,000$ 9,400,000