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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 75,740.9 $ 78,710.3
Fixed maturities, trading 492.9 532.1
Equity securities 2,526.3 2,013.4
Derivative instruments, assets 337.8 463.5
Separate account assets 177,829.0 175,951.4
Investment and universal life contracts $ (177.1) (467.8)
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%  
Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Unfunded commitments of investments measured using NAV $ 13.5 15.1
U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,886.8 2,111.5
Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,053.7 1,073.7
States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,937.1 9,167.8
Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 45,189.3 47,354.8
Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,797.8 2,986.8
Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,940.9 4,942.3
Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,150.3 4,027.5
Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,785.0 7,045.9
Recurring Fair Value Measurements    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 75,740.9 78,710.3
Fixed maturities, trading 492.9 532.1
Equity securities 2,526.3 2,013.4
Derivative instruments, assets 337.8 463.5
Other investments 743.1 746.3
Cash equivalents 763.9 1,466.4
Sub-total excluding separate account assets 80,604.9 83,932.0
Separate account assets 177,829.0 175,951.4
Total assets 258,433.9 259,883.4
Investment and universal life contracts (177.1) (467.8)
Derivative liabilities (173.0) (186.1)
Other liabilities (1.5) (0.4)
Total liabilities (351.6) (654.3)
Net assets (liabilities) 258,082.3 259,229.1
Recurring Fair Value Measurements | Amount measured at net asset value    
Assets (liabilities) measured at fair value on a recurring basis    
Other investments 76.5 75.7
Sub-total excluding separate account assets 76.5 75.7
Separate account assets 7,348.2 155.8
Total assets 7,424.7 231.5
Net assets (liabilities) 7,424.7 231.5
Recurring Fair Value Measurements | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,601.5 1,769.4
Fixed maturities, trading 0.5 0.5
Equity securities 1,152.2 659.7
Other investments 233.1 252.8
Cash equivalents 76.5 38.3
Sub-total excluding separate account assets 3,063.8 2,720.7
Separate account assets 104,911.1 102,550.5
Total assets 107,974.9 105,271.2
Net assets (liabilities) 107,974.9 105,271.2
Recurring Fair Value Measurements | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 73,424.8 76,580.5
Fixed maturities, trading 492.4 531.6
Equity securities 1,374.1 1,353.7
Derivative instruments, assets 337.1 462.9
Other investments 392.4 385.9
Cash equivalents 687.4 1,428.1
Sub-total excluding separate account assets 76,708.2 80,742.7
Separate account assets 64,373.5 64,351.9
Total assets 141,081.7 145,094.6
Derivative liabilities (161.6) (180.4)
Other liabilities (1.5) (0.4)
Total liabilities (163.1) (180.8)
Net assets (liabilities) 140,918.6 144,913.8
Recurring Fair Value Measurements | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 714.6 360.4
Derivative instruments, assets 0.7 0.6
Other investments 41.1 31.9
Sub-total excluding separate account assets 756.4 392.9
Separate account assets 1,196.2 8,893.2
Total assets 1,952.6 9,286.1
Investment and universal life contracts (177.1) (467.8)
Derivative liabilities (11.4) (5.7)
Total liabilities (188.5) (473.5)
Net assets (liabilities) 1,764.1 8,812.6
Recurring Fair Value Measurements | U.S. government and agencies    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,886.8 2,111.5
Recurring Fair Value Measurements | U.S. government and agencies | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,570.7 1,768.3
Recurring Fair Value Measurements | U.S. government and agencies | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 316.1 343.2
Recurring Fair Value Measurements | Non-U.S. governments    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,053.7 1,073.7
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 0.9 1.1
Recurring Fair Value Measurements | Non-U.S. governments | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 1,052.8 1,072.6
Recurring Fair Value Measurements | States and political subdivisions    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,937.1 9,167.8
Recurring Fair Value Measurements | States and political subdivisions | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 8,937.1 9,167.8
Recurring Fair Value Measurements | Corporate debt securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 45,189.3 47,354.8
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 1    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 29.9  
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 44,816.1 47,064.0
Recurring Fair Value Measurements | Corporate debt securities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 343.3 290.8
Recurring Fair Value Measurements | Residential mortgage-backed pass-through securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 2,797.8 2,986.8
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    
Fixed maturities, available-for-sale 2,797.8 2,986.8
Recurring Fair Value Measurements | Commercial mortgage-backed securities    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,940.9 4,942.3
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,929.4 4,929.1
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 11.5 13.2
Recurring Fair Value Measurements | Collateralized debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 4,150.3 4,027.5
Recurring Fair Value Measurements | Collateralized debt obligations | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 3,827.0 4,000.3
Recurring Fair Value Measurements | Collateralized debt obligations | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 323.3 27.2
Recurring Fair Value Measurements | Other debt obligations    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,785.0 7,045.9
Recurring Fair Value Measurements | Other debt obligations | Fair value hierarchy Level 2    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale 6,748.5 7,016.7
Recurring Fair Value Measurements | Other debt obligations | Fair value hierarchy Level 3    
Assets (liabilities) measured at fair value on a recurring basis    
Fixed maturities, available-for-sale $ 36.5 $ 29.2