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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets $ 821.3 $ 661.8
Separate account assets 134,045.8 140,072.8
Investment-type insurance contracts $ (210.3) (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 $ 49,780.6 49,670.8
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,543.6 1,121.8
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 787.7 891.1
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,455.7 4,204.0
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 31,278.7 31,535.0
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,680.2 2,822.9
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,861.2 3,975.5
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 633.0 504.1
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,540.5 4,616.4
Equity securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 465.3 123.0
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 821.3 661.8
Other investments 425.4 478.9
Cash equivalents 1,153.6 1,041.7
Sub-total excluding separate account assets 54,225.5 53,421.0
Separate account assets 134,045.8 140,072.8
Total assets 188,271.3 193,493.8
Investment-type insurance contracts (210.3) (176.4)
Derivative liabilities (816.9) (791.8)
Other liabilities (301.4) (310.1)
Total liabilities (1,328.6) (1,278.3)
Net assets (liabilities) 186,942.7 192,215.5
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 177.8 3.3
Sub-total excluding separate account assets 1,424.2 934.2
Separate account assets 69,860.6 73,363.4
Total assets 71,284.8 74,297.6
Net assets (liabilities) 71,284.8 74,297.6
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 768.8 608.1
Other investments 216.1 348.4
Cash equivalents 1,153.6 1,041.7
Sub-total excluding separate account assets 52,196.5 51,749.9
Separate account assets 57,449.1 60,818.0
Total assets 109,645.6 112,567.9
Derivative liabilities (771.2) (756.3)
Other liabilities (236.7) (243.8)
Total liabilities (1,007.9) (1,000.1)
Net assets (liabilities) 108,637.7 111,567.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative assets 52.5 53.7
Other investments 31.5 127.2
Sub-total excluding separate account assets 604.8 736.9
Separate account assets 6,736.1 5,891.4
Total assets 7,340.9 6,628.3
Investment-type insurance contracts (210.3) (176.4)
Derivative liabilities (45.7) (35.5)
Other liabilities (64.7) (66.3)
Total liabilities (320.7) (278.2)
Net assets (liabilities) 7,020.2 6,350.1
Recurring Fair Value Measurements | Fixed maturities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 49,780.6 49,670.8
Trading 710.2 604.6
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 937.1 760.8
Trading 101.7  
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 48,465.8 48,497.8
Trading 469.5 464.9
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 377.7 412.2
Trading 139.0 139.7
Recurring Fair Value Measurements | U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,543.6 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 895.7 720.5
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 647.9 401.3
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 787.7 891.1
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 2.8  
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 736.0 852.4
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 48.9 38.7
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,455.7 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 4,455.7 4,204.0
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 31,278.7 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 38.6 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 31,003.3 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 236.8 245.6
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,680.2 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 2,680.2 2,822.9
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,861.2 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 3,845.9 3,975.5
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 15.3  
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 633.0 504.1
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 569.8 439.9
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 63.2 64.2
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 4,540.5 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 4,527.0 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 13.5 63.7
Recurring Fair Value Measurements | Equity securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 465.3 123.0
Trading 869.1 840.2
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 105.8 64.2
Trading 101.8 105.9
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 355.4 54.7
Trading 767.3 734.3
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