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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Assets (liabilities) measured at fair value on a recurring basis    
Derivative instruments, assets $ 314.9 $ 893.6
Separate account assets 149,347.9 139,832.6
Investment contracts (146.6) (176.5)
Unfunded commitments of investments measured using NAV $ 51.9 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 $ 57,799.8 54,846.1
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,420.3 1,433.0
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,043.2 893.6
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 6,369.4 5,569.2
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 35,970.8 34,192.4
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,746.0 2,834.7
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,817.9 4,096.5
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,203.8 758.6
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 5,228.4 5,068.1
Equity securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 103.7 98.9
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative instruments, assets 314.9 893.6
Other investments 547.8 470.0
Other investments net asset value 84.1 92.7
Cash equivalents 1,190.2 1,947.1
Sub-total excluding separate account assets 61,784.1 60,067.5
Sub-total excluding separate account assets net asset value 84.1 92.7
Separate account assets 149,347.9 139,832.6
Total assets 211,132.0 199,900.1
Total assets net asset value 84.1 92.7
Investment contracts (146.6) (176.5)
Derivative liabilities (295.9) (573.0)
Other liabilities (239.0) (272.2)
Total liabilities (681.5) (1,021.7)
Net assets (liabilities) 210,450.5 198,878.4
Net assets (liabilities) net asset value 84.1 92.7
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 195.2 169.8
Cash equivalents 48.6 51.2
Sub-total excluding separate account assets 1,786.1 1,742.6
Separate account assets 85,287.5 79,688.1
Total assets 87,073.6 81,430.7
Net assets (liabilities) 87,073.6 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 283.3 859.7
Other investments 233.3 170.6
Cash equivalents 1,141.6 1,895.9
Sub-total excluding separate account assets 59,384.0 57,548.4
Separate account assets 56,647.5 52,789.7
Total assets 116,031.5 110,338.1
Derivative liabilities (283.3) (550.4)
Other liabilities (239.0) (212.3)
Total liabilities (522.3) (762.7)
Net assets (liabilities) 115,509.2 109,575.4
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Derivative instruments, assets 31.6 33.9
Other investments 35.2 36.9
Sub-total excluding separate account assets 529.9 683.8
Separate account assets 7,412.9 7,354.8
Total assets 7,942.8 8,038.6
Investment contracts (146.6) (176.5)
Derivative liabilities (12.6) (22.6)
Other liabilities   (59.9)
Total liabilities (159.2) (259.0)
Net assets (liabilities) 7,783.6 7,779.6
Recurring Fair Value Measurements | Fixed maturities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 57,799.8 54,846.1
Trading 241.3 398.4
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 998.6 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 56,340.8 53,308.0
Trading 241.3 305.5
Recurring Fair Value Measurements | Fixed maturities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 460.4 517.4
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 1,420.3 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 974.5 996.5
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 445.8 436.5
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,043.2 893.6
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 3.1 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 975.0 828.5
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 65.1 62.1
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 6,369.4 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 6,369.4 5,569.2
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 35,970.8 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 35,746.9 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 202.9 259.1
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 2,746.0 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 2,746.0 2,834.7
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 3,817.9 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 3,756.4 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 61.5 71.1
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 1,203.8 758.6
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 1,075.7 725.0
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 128.1 33.6
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 5,228.4 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 5,225.6 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 2.8 91.5
Recurring Fair Value Measurements | Equity securities    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 103.7 98.9
Trading 1,586.4 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 56.5 55.2
Trading 487.2 445.7
Recurring Fair Value Measurements | Equity securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Available-for-sale 44.5 41.0
Trading 1,099.2 967.7
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