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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets $ 589.6 $ 661.8
Separate account assets 142,993.6 140,072.8
Investment-type insurance contracts $ (117.0) (176.4)
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 $ 48,949.7 49,670.8
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,316.3 1,121.8
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 799.3 891.1
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,278.4 4,204.0
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 30,823.7 31,535.0
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,666.5 2,822.9
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,875.2 3,975.5
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 642.0 504.1
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,548.3 4,616.4
Equity securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 176.1 123.0
Recurring Fair Value Measurements | Assets (liabilities) measured at fair value    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 589.6 661.8
Other investments 458.5 478.9
Cash equivalents 1,441.0 1,041.7
Sub-total excluding separate account assets 53,067.0 53,421.0
Separate account assets 142,993.6 140,072.8
Total assets 196,060.6 193,493.8
Investment-type insurance contracts (117.0) (176.4)
Derivative liabilities (790.6) (791.8)
Other liabilities (303.7) (310.1)
Total liabilities (1,211.3) (1,278.3)
Net assets (liabilities) 194,849.3 192,215.5
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 2.9 3.3
Sub-total excluding separate account assets 1,078.2 934.2
Separate account assets 75,310.0 73,363.4
Total assets 76,388.2 74,297.6
Net assets (liabilities) 76,388.2 74,297.6
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 544.5 608.1
Other investments 425.9 348.4
Cash equivalents 1,441.0 1,041.7
Sub-total excluding separate account assets 51,392.8 51,749.9
Separate account assets 61,277.6 60,818.0
Total assets 112,670.4 112,567.9
Derivative liabilities (753.6) (756.3)
Other liabilities (236.2) (243.8)
Total liabilities (989.8) (1,000.1)
Net assets (liabilities) 111,680.6 111,567.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 45.1 53.7
Other investments 29.7 127.2
Sub-total excluding separate account assets 596.0 736.9
Separate account assets 6,406.0 5,891.4
Total assets 7,002.0 6,628.3
Investment-type insurance contracts (117.0) (176.4)
Derivative liabilities (37.0) (35.5)
Other liabilities (67.5) (66.3)
Total liabilities (221.5) (278.2)
Net assets (liabilities) 6,780.5 6,350.1
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 48,949.7 49,670.8
Trading 560.3 604.6
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 883.0 760.8
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 47,689.4 48,497.8
Trading 420.5 464.9
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 377.3 412.2
Trading 139.8 139.7
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 1,316.3 1,121.8
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 840.9 720.5
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 475.4 401.3
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 799.3 891.1
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3.3  
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 750.4 852.4
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 45.6 38.7
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 4,278.4 4,204.0
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 4,278.4 4,204.0
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 30,823.7 31,535.0
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 38.8 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 30,557.9 31,249.1
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 227.0 245.6
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 2,666.5 2,822.9
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 2,666.5 2,822.9
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 3,875.2 3,975.5
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 3,875.2 3,975.5
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 642.0 504.1
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 578.7 439.9
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 63.3 64.2
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 4,548.3 4,616.4
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 4,506.9 4,552.7
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 41.4 63.7
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 176.1 123.0
Trading 891.8 840.2
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 83.7 64.2
Trading 108.6 105.9
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 88.3 54.7
Trading 783.2 734.3
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale $ 4.1 $ 4.1