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Investments (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Investments    
Percent of Total 100.00% 100.00%
Amortized Cost, total investment portfolio $ 10,562.3 $ 10,372.5
Gross Unrealized Gains, total investment portfolio 647.0 622.0
Gross Unrealized Losses, total investment portfolio (101.0) (118.6)
Estimated Fair Value, total investment portfolio 11,108.3 10,875.9
AOCI Gain (Loss) on Securities with OTTI (18.7) 2.3
Percentage of mortgage backed securities representing government-agency obligations 65.00% 66.00%
Percentage of mortgage backed securities representing government-agency obligations exclusive of loss mitigation related purchases 70.00% 71.00%
Unrealized gains (losses) included in AOCI for recognized OTTI, net of tax (10.7) 3.1
Unrealized gains included in AOCI for unrecognized OTTI, net of tax 406.6 363.6
Fixed maturity securities
   
Investments    
Percent of Total 91.00% 93.00%
Amortized Cost, total fixed maturity securities 9,659.4 9,638.5
Gross Unrealized Gains, total fixed maturity securities 646.5 622.0
Gross Unrealized Losses, total fixed maturity securities (101.0) (118.6)
Estimated Fair Value, total fixed maturity securities 10,204.9 10,141.9
AOCI Gain (Loss) on Securities with OTTI (18.7) 2.3
U.S. government and agencies
   
Investments    
Percent of Total 8.00% 8.00%
Amortized Cost, total fixed maturity securities 803.2 850.2
Gross Unrealized Gains, total fixed maturity securities 63.7 72.3
Gross Unrealized Losses, total fixed maturity securities (0.2) (0.1)
Estimated Fair Value, total fixed maturity securities 866.7 922.4
Obligations of state and political subdivisions
   
Investments    
Percent of Total 49.00% 49.00%
Amortized Cost, total fixed maturity securities 5,144.3 5,097.3
Gross Unrealized Gains, total fixed maturity securities 383.2 358.6
Gross Unrealized Losses, total fixed maturity securities (1.4) (0.5)
Estimated Fair Value, total fixed maturity securities 5,526.1 5,455.4
AOCI Gain (Loss) on Securities with OTTI 6.4 5.7
Corporate securities
   
Investments    
Percent of Total 9.00% 10.00%
Amortized Cost, total fixed maturity securities 986.8 989.0
Gross Unrealized Gains, total fixed maturity securities 56.2 51.8
Gross Unrealized Losses, total fixed maturity securities (0.2) (2.4)
Estimated Fair Value, total fixed maturity securities 1,042.8 1,038.4
AOCI Gain (Loss) on Securities with OTTI 0.3 (0.2)
RMBS
   
Investments    
Percent of Total 14.00% 14.00%
Amortized Cost, total fixed maturity securities 1,439.7 1,454.3
Gross Unrealized Gains, total fixed maturity securities 63.7 63.9
Gross Unrealized Losses, total fixed maturity securities (79.4) (90.3)
Estimated Fair Value, total fixed maturity securities 1,424.0 1,427.9
AOCI Gain (Loss) on Securities with OTTI (54.1) (35.1)
CMBS
   
Investments    
Percent of Total 4.00% 5.00%
Amortized Cost, total fixed maturity securities 472.1 475.6
Gross Unrealized Gains, total fixed maturity securities 29.4 24.4
Gross Unrealized Losses, total fixed maturity securities 0  
Estimated Fair Value, total fixed maturity securities 501.5 500.0
AOCI Gain (Loss) on Securities with OTTI 3.1 2.7
Asset-backed securities
   
Investments    
Percent of Total 4.00% 4.00%
Amortized Cost, total fixed maturity securities 463.6 439.5
Gross Unrealized Gains, total fixed maturity securities 34.6 37.7
Gross Unrealized Losses, total fixed maturity securities (15.3) (19.1)
Estimated Fair Value, total fixed maturity securities 482.9 458.1
AOCI Gain (Loss) on Securities with OTTI 25.6 29.2
Foreign government securities
   
Investments    
Percent of Total 3.00% 3.00%
Amortized Cost, total fixed maturity securities 349.7 332.6
Gross Unrealized Gains, total fixed maturity securities 15.7 13.3
Gross Unrealized Losses, total fixed maturity securities (4.5) (6.2)
Estimated Fair Value, total fixed maturity securities 360.9 339.7
Short-term investments.
   
Investments    
Percent of Total 9.00% 7.00%
Amortized Cost, total investment portfolio 902.9 734.0
Gross Unrealized Gains, total investment portfolio 0.5  
Estimated Fair Value, total investment portfolio $ 903.4 $ 734.0