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Fair Value Measurement (Details) (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
Fair value measurement on recurring basis
  
Assets:  
Total fixed maturity securities10,091,200,0009,402,300,000
Short-term investments873,300,0001,055,600,000
Other invested assets106,000,00033,300,000
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
Total assets carried at fair value14,590,800,00014,786,000,000
Liabilities:  
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
Other liabilities 100,000
Total liabilities carried at fair value5,203,900,0006,831,000,000
Fair value measurement on recurring basis | Level 1
  
Assets:  
Short-term investments151,700,000277,400,000
Other invested assets200,000200,000
Other assets25,500,00025,700,000
Total assets carried at fair value177,400,000303,300,000
Fair value measurement on recurring basis | Level 2
  
Assets:  
Total fixed maturity securities9,748,800,0009,092,700,000
Short-term investments721,600,000778,200,000
Other invested assets95,200,00021,400,000
Other assets 18,700,000
Total assets carried at fair value10,565,600,0009,911,000,000
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 securities936,400,0001,048,200,000
Fair value measurement on recurring basis | Level 2 | Obligations of state and political subdivisions
  
Assets:  
Total fixed maturity securities5,368,400,0004,959,900,000
Fair value measurement on recurring basis | Level 2 | Corporate securities
  
Assets:  
Total fixed maturity securities1,110,700,000992,500,000
Fair value measurement on recurring basis | Level 2 | RMBS
  
Assets:  
Total fixed maturity securities1,237,700,0001,071,700,000
Fair value measurement on recurring basis | Level 2 | CMBS
  
Assets:  
Total fixed maturity securities508,400,000379,100,000
Fair value measurement on recurring basis | Level 2 | Asset-backed securities
  
Assets:  
Total fixed maturity securities250,600,000292,700,000
Fair value measurement on recurring basis | Level 2 | Foreign government securities
  
Assets:  
Total fixed maturity securities336,600,000348,600,000
Fair value measurement on recurring basis | Level 3
  
Assets:  
Total fixed maturity securities342,400,000309,600,000
Other invested assets10,600,00011,700,000
Credit derivative assets467,200,000592,900,000
FG VIEs' assets, at fair value3,005,400,0003,657,500,000
Other assets22,200,000 
Total assets carried at fair value3,847,800,0004,571,700,000
Liabilities:  
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
Total liabilities carried at fair value5,203,900,0006,830,900,000
Fair value measurement on recurring basis | Level 3 | RMBS
  
Assets:  
Total fixed maturity securities91,900,00099,400,000
Fair value measurement on recurring basis | Level 3 | Asset-backed securities
  
Assets:  
Total fixed maturity securities250,500,000210,200,000
Fair value measurement on recurring basis | U.S. government and agencies
  
Assets:  
Total fixed maturity securities936,400,0001,048,200,000
Fair value measurement on recurring basis | Obligations of state and political subdivisions
  
Assets:  
Total fixed maturity securities5,368,400,0004,959,900,000
Fair value measurement on recurring basis | Corporate securities
  
Assets:  
Total fixed maturity securities1,110,700,000992,500,000
Fair value measurement on recurring basis | RMBS
  
Assets:  
Total fixed maturity securities1,329,600,0001,171,100,000
Fair value measurement on recurring basis | CMBS
  
Assets:  
Total fixed maturity securities508,400,000379,100,000
Fair value measurement on recurring basis | Asset-backed securities
  
Assets:  
Total fixed maturity securities501,100,000502,900,000
Fair value measurement on recurring basis | Foreign government securities
  
Assets:  
Total fixed maturity securities336,600,000348,600,000
Fair value measurement on non-recurring basis | Level 3
  
Liabilities:  
Mortgage loans recorded at fair value$ 8,700,000$ 9,400,000