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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Assets (liabilities) measured at fair value on a recurring basis    
Derivative instruments, assets $ 321.2 $ 893.6
Separate account assets 154,085.9 139,832.6
Investment contracts (138.2) (176.5)
Unfunded commitments of investments measured using NAV $ 47.7 57.6
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 $ 59,137.8 54,846.1
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,457.7 1,433.0
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,071.3 893.6
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 6,655.6 5,569.2
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 36,888.3 34,192.4
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,637.9 2,834.7
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,749.5 4,096.5
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,239.2 758.6
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 5,438.3 5,068.1
Equity securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 118.3 98.9
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative instruments, assets 321.2 893.6
Other investments 555.6 470.0
Other investments net asset value 88.3 92.7
Cash equivalents 1,892.4 1,947.1
Sub-total excluding separate account assets 63,928.7 60,067.5
Sub-total excluding separate account assets net asset value 88.3 92.7
Separate account assets 154,085.9 139,832.6
Separate account assets net asset value 118.6  
Total assets 218,014.6 199,900.1
Total assets net asset value 206.9 92.7
Investment contracts (138.2) (176.5)
Derivative liabilities (264.4) (573.0)
Other liabilities (242.8) (272.2)
Total liabilities (645.4) (1,021.7)
Net assets (liabilities) 217,369.2 198,878.4
Net assets (liabilities) net asset value 206.9 92.7
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 154.8 169.8
Cash equivalents 67.7 51.2
Sub-total excluding separate account assets 1,823.2 1,742.6
Separate account assets 86,763.9 79,688.1
Total assets 88,587.1 81,430.7
Net assets (liabilities) 88,587.1 81,430.7
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative instruments, assets 291.9 859.7
Other investments 277.6 170.6
Cash equivalents 1,824.7 1,895.9
Sub-total excluding separate account assets 61,474.8 57,548.4
Separate account assets 59,740.1 52,789.7
Total assets 121,214.9 110,338.1
Derivative liabilities (256.7) (550.4)
Other liabilities (242.8) (212.3)
Total liabilities (499.5) (762.7)
Net assets (liabilities) 120,715.4 109,575.4
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative instruments, assets 29.3 33.9
Other investments 34.9 36.9
Sub-total excluding separate account assets 542.4 683.8
Separate account assets 7,463.3 7,354.8
Total assets 8,005.7 8,038.6
Investment contracts (138.2) (176.5)
Derivative liabilities (7.7) (22.6)
Other liabilities   (59.9)
Total liabilities (145.9) (259.0)
Net assets (liabilities) 7,859.8 7,779.6
Recurring Fair Value Measurements | Fixed maturities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 59,137.8 54,846.1
Trading 232.5 398.4
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,031.3 1,020.7
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 57,631.0 53,308.0
Trading 232.5 305.5
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 475.5 517.4
Trading   92.9
Recurring Fair Value Measurements | U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,457.7 1,433.0
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 1,007.0 996.5
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 450.7 436.5
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,071.3 893.6
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 3.0
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 1,013.8 828.5
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 54.2 62.1
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 6,655.6 5,569.2
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 6,655.6 5,569.2
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 36,888.3 34,192.4
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 21.0 21.2
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 36,625.2 33,912.1
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 242.1 259.1
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,637.9 2,834.7
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 2,637.9 2,834.7
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,749.5 4,096.5
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 3,734.8 4,025.4
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 14.7 71.1
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,239.2 758.6
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 1,077.3 725.0
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 161.9 33.6
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 5,438.3 5,068.1
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 5,435.7 4,976.6
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 2.6 91.5
Recurring Fair Value Measurements | Equity securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 118.3 98.9
Trading 1,670.9 1,413.4
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 68.5 55.2
Trading 500.9 445.7
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 47.1 41.0
Trading 1,170.0 967.7
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale $ 2.7 $ 2.7