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Investments (Details 2) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Investments  
Percent of Total (as a percent)100.00%100.00%
Amortized Cost, total investment portfolio$ 10,523,600,000$ 10,330,000,000
Gross Unrealized Gains, total investment portfolio550,400,000260,200,000
Gross Unrealized Losses, total investment portfolio(109,500,000)(132,300,000)
Estimated Fair Value, total investment portfolio10,964,500,00010,457,900,000
AOCI Gain (Loss) on Securities with OTTI(20,000,000)(11,400,000)
Percentage of mortgage backed securities that are government agency obligations (as a percent)65.00%64.00%
Unrealized gains (losses) included in AOCI for recognized OTTI, net of tax(11,300,000)(5,600,000)
Unrealized gains (losses) included in AOCI for not recognized OTTI, net of tax337,200,000115,300,000
Fixed maturity securities
  
Investments  
Percent of Total (as a percent)92.00%90.00%
Amortized Cost, total fixed maturity securities9,650,300,0009,274,700,000
Gross Unrealized Gains, total fixed maturity securities550,400,000259,900,000
Gross Unrealized Losses, total fixed maturity securities(109,500,000)(132,300,000)
Estimated Fair Value, total fixed maturity securities10,091,200,0009,402,300,000
AOCI Gain (Loss) on Securities with OTTI(20,000,000)(11,400,000)
U.S. government and agencies
  
Investments  
Percent of Total (as a percent)8.00%10.00%
Amortized Cost, total fixed maturity securities862,600,0001,000,300,000
Gross Unrealized Gains, total fixed maturity securities73,900,00048,300,000
Gross Unrealized Losses, total fixed maturity securities(100,000)(400,000)
Estimated Fair Value, total fixed maturity securities936,400,0001,048,200,000
Obligations of state and political subdivisions
  
Investments  
Percent of Total (as a percent)48.00%48.00%
Amortized Cost, total fixed maturity securities5,066,800,0004,922,000,000
Gross Unrealized Gains, total fixed maturity securities303,400,00099,900,000
Gross Unrealized Losses, total fixed maturity securities(1,800,000)(62,000,000)
Estimated Fair Value, total fixed maturity securities5,368,400,0004,959,900,000
AOCI Gain (Loss) on Securities with OTTI5,600,000(1,400,000)
Corporate securities
  
Investments  
Percent of Total (as a percent)10.00%9.00%
Amortized Cost, total fixed maturity securities1,064,700,000980,100,000
Gross Unrealized Gains, total fixed maturity securities48,300,00025,200,000
Gross Unrealized Losses, total fixed maturity securities(2,300,000)(12,800,000)
Estimated Fair Value, total fixed maturity securities1,110,700,000992,500,000
AOCI Gain (Loss) on Securities with OTTI100,000200,000
RMBS
  
Investments  
Percent of Total (as a percent)13.00%11.00%
Amortized Cost, total fixed maturity securities1,341,900,0001,158,900,000
Gross Unrealized Gains, total fixed maturity securities68,300,00056,500,000
Gross Unrealized Losses, total fixed maturity securities(80,600,000)(44,300,000)
Estimated Fair Value, total fixed maturity securities1,329,600,0001,171,100,000
AOCI Gain (Loss) on Securities with OTTI(46,300,000)(8,600,000)
CMBS
  
Investments  
Percent of Total (as a percent)5.00%4.00%
Amortized Cost, total fixed maturity securities490,800,000365,700,000
Gross Unrealized Gains, total fixed maturity securities17,600,00014,800,000
Gross Unrealized Losses, total fixed maturity securities0(1,400,000)
Estimated Fair Value, total fixed maturity securities508,400,000379,100,000
AOCI Gain (Loss) on Securities with OTTI2,200,0002,500,000
Asset-backed securities
  
Investments  
Percent of Total (as a percent)5.00%5.00%
Amortized Cost, total fixed maturity securities492,500,000498,200,000
Gross Unrealized Gains, total fixed maturity securities28,000,0009,900,000
Gross Unrealized Losses, total fixed maturity securities(19,400,000)(5,200,000)
Estimated Fair Value, total fixed maturity securities501,100,000502,900,000
AOCI Gain (Loss) on Securities with OTTI18,400,000(4,100,000)
Foreign government securities
  
Investments  
Percent of Total (as a percent)3.00%3.00%
Amortized Cost, total fixed maturity securities331,000,000349,500,000
Gross Unrealized Gains, total fixed maturity securities10,900,0005,300,000
Gross Unrealized Losses, total fixed maturity securities(5,300,000)(6,200,000)
Estimated Fair Value, total fixed maturity securities336,600,000348,600,000
Short-term investments.
  
Investments  
Percent of Total (as a percent)8.00%10.00%
Amortized Cost, total fixed maturity securities873,300,0001,055,300,000
Gross Unrealized Gains, total fixed maturity securities 300,000
Estimated Fair Value, total fixed maturity securities$ 873,300,000$ 1,055,600,000