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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets $ 608.0 $ 665.1
Separate account assets 132,804.6 130,018.4
Investment-type insurance contracts (25.8) (6.9)
Fixed maturities valued using internal pricing models    
Fixed maturities classified as Level 3 assets, percent valued using internal pricing models (as a percent) 1.00%  
Fixed maturities
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 50,048.1 48,757.1
U.S. government and agencies
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 780.5 780.5
Non-U.S. governments
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,024.6 996.8
States and political subdivisions
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,973.1 3,658.0
Corporate debt securities
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 32,623.8 31,919.0
Residential mortgage-backed pass-through securities
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,900.9 2,845.2
Commercial mortgage-backed securities
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,087.1 4,026.4
Collateralized debt obligations
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 380.9 363.4
Other debt obligations
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,277.2 4,167.8
Equity securities
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 136.1 110.5
Recurring Fair Value Measurements | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 608.0 665.1
Other investments 371.0 361.1
Cash equivalents 581.3 1,459.0
Sub-total excluding separate account assets 53,044.0 52,632.8
Separate account assets 132,804.6 130,018.4
Total assets 185,848.6 182,651.2
Investment-type insurance contracts (25.8) (6.9)
Derivative liabilities (906.9) (1,024.6)
Other liabilities (326.0) (322.1)
Total liabilities (1,258.7) (1,353.6)
Net assets (liabilities) 184,589.9 181,297.6
Recurring Fair Value Measurements | Fair value hierarchy Level 1
   
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 6.9 6.8
Sub-total excluding separate account assets 636.9 599.6
Separate account assets 69,771.1 67,215.1
Total assets 70,408.0 67,814.7
Net assets (liabilities) 70,408.0 67,814.7
Recurring Fair Value Measurements | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 542.9 590.9
Other investments 230.5 211.4
Cash equivalents 581.3 1,459.0
Sub-total excluding separate account assets 51,712.5 51,292.5
Separate account assets 57,692.5 57,538.1
Total assets 109,405.0 108,830.6
Derivative liabilities (872.5) (985.0)
Other liabilities (250.1) (248.2)
Total liabilities (1,122.6) (1,233.2)
Net assets (liabilities) 108,282.4 107,597.4
Recurring Fair Value Measurements | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 65.1 74.2
Other investments 133.6 142.9
Sub-total excluding separate account assets 694.6 740.7
Separate account assets 5,341.0 5,265.2
Total assets 6,035.6 6,005.9
Investment-type insurance contracts (25.8) (6.9)
Derivative liabilities (34.4) (39.6)
Other liabilities (75.9) (73.9)
Total liabilities (136.1) (120.4)
Net assets (liabilities) 5,899.5 5,885.5
Recurring Fair Value Measurements | Fixed maturities | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 50,048.1 48,757.1
Trading 575.3 563.1
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 1
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 468.1 449.6
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 49,276.3 47,970.7
Trading 400.7 393.2
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 303.7 336.8
Trading 174.6 169.9
Recurring Fair Value Measurements | U.S. government and agencies | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 780.5 780.5
Recurring Fair Value Measurements | U.S. government and agencies | Fair value hierarchy Level 1
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 426.9 409.3
Recurring Fair Value Measurements | U.S. government and agencies | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 353.6 371.2
Recurring Fair Value Measurements | Non-U.S. governments | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,024.6 996.8
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 974.5 949.3
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 50.1 47.5
Recurring Fair Value Measurements | States and political subdivisions | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,973.1 3,658.0
Recurring Fair Value Measurements | States and political subdivisions | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,971.3 3,656.2
Recurring Fair Value Measurements | States and political subdivisions | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1.8 1.8
Recurring Fair Value Measurements | Corporate debt securities | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 32,623.8 31,919.0
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 1
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 41.2 40.3
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 32,416.6 31,714.7
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 166.0 164.0
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,900.9 2,845.2
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,900.9 2,845.2
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,087.1 4,026.4
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,079.4 4,024.8
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 7.7 1.6
Recurring Fair Value Measurements | Collateralized debt obligations | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 380.9 363.4
Recurring Fair Value Measurements | Collateralized debt obligations | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 350.5 325.6
Recurring Fair Value Measurements | Collateralized debt obligations | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 30.4 37.8
Recurring Fair Value Measurements | Other debt obligations | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,277.2 4,167.8
Recurring Fair Value Measurements | Other debt obligations | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,229.5 4,083.7
Recurring Fair Value Measurements | Other debt obligations | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 47.7 84.1
Recurring Fair Value Measurements | Equity securities | Assets (liabilities) measured at fair value
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 136.1 110.5
Trading 724.2 716.9
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 1
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 49.4 38.1
Trading 112.5 105.1
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 2
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 69.1 55.5
Trading 611.7 611.8
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 3
   
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale $ 17.6 $ 16.9