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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
Beginning balance, net derivative assets (liabilities) $ 5.3 $ (4.0) $ (4.0) $ 0.6 $ (5.1)
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) $ (3.8) $ 5.0 $ 6.1 $ (4.0) $ (5.0)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
Total realized/unrealized gains (losses) included in other comprehensive income, net derivative assets (liabilities)       $ (0.3)  
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) $ 0.3   $ 3.1   $ 10.7
Transfers into Level 3, net derivative assets (liabilities)     0.1    
Transfers out of Level 3, net derivative assets (liabilities)       $ (0.3)  
Ending balance, net derivative assets (liabilities) 1.8 $ 1.0 5.3 (4.0) 0.6
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (3.8) 4.9 7.3 (4.0)  
Gross purchases, sales, issuances and settlements          
Purchases, net derivative assets (liabilities) 0.3   0.8    
Sales, net derivative assets (liabilities)     2.3   10.7
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 0.3   3.1   10.7
Investment and universal life contracts          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, liabilities (115.5) (46.3) (46.3) (83.2) (90.8)
Total realized/unrealized gains (losses) included in net income, liabilities (60.6) (18.4) (37.8) 36.1 (15.6)
Net purchases, sales, issuances and settlements, liabilities (53.9) (4.9) (31.4) 0.8 23.2
Ending balance, liabilities (230.0) (69.6) (115.5) (46.3) (83.2)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (59.5) (17.7) (29.2) 22.6 (8.6)
Gross purchases, sales, issuances and settlements          
Issuances, liabilities (90.1) (18.9) (69.9) (22.2) (19.5)
Settlements, liabilities 36.2 14.0 38.5 23.0 42.7
Net purchases, sales, issuances and settlements, liabilities (53.9) (4.9) (31.4) 0.8 23.2
Funds withheld payable embedded derivative          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 2,326.1 3,652.8 3,652.8    
Total realized/unrealized gains (losses) included in net income, assets 548.8 (532.7) (1,326.7) 3,652.8  
Ending balance, assets 2,874.9 3,120.1 2,326.1 3,652.8  
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 548.8 (532.7) (1,326.7) 3,652.8  
Fixed maturities | Available-for-sale          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 3,635.1 2,164.8 2,164.8 1,073.8 360.4
Total realized/unrealized gains (losses) included in net income, assets (6.8) (3.2) (3.2) (5.1) (24.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (45.7) (31.1) 17.2 (74.5) 22.0
Net purchases, sales, issuances and settlements, assets 88.3 613.3 1,294.3 1,246.1 803.1
Transfers into Level 3, assets 210.0 307.8 451.9 188.3 348.8
Transfers out of Level 3, assets (111.6) (179.0) (289.9) (263.8) (435.6)
Ending balance, assets 3,769.3 2,872.6 3,635.1 2,164.8 1,073.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (6.6) (3.2) 2.2 0.6 (5.7)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (48.7) (29.6) (72.1) (60.5) 13.3
Gross purchases, sales, issuances and settlements          
Purchases, assets 571.4 679.6 1,545.5 1,456.6 1,102.1
Sales, assets (298.5) (11.7) (27.7) (62.7) (84.3)
Settlements, assets (184.6) (54.6) (223.5) (147.8) (214.7)
Net purchases, sales, issuances and settlements, assets 88.3 613.3 1,294.3 1,246.1 803.1
Fixed maturities | Trading          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 379.8 106.2 106.2 4.9  
Total realized/unrealized gains (losses) included in net income, assets (2.4) (0.5) 2.4 (0.6)  
Net purchases, sales, issuances and settlements, assets (58.7) 34.2 271.2 72.9 4.9
Transfers into Level 3, assets       29.0  
Ending balance, assets 318.7 139.9 379.8 106.2 4.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 1.4 (0.6) 2.3 (0.6)  
Gross purchases, sales, issuances and settlements          
Purchases, assets 122.4 38.5 424.7 106.9 4.9
Sales, assets (111.4) (3.4) (138.7) (32.6)  
Settlements, assets (69.7) (0.9) (14.8) (1.4)  
Net purchases, sales, issuances and settlements, assets (58.7) 34.2 271.2 72.9 4.9
States and political subdivisions | Available-for-sale          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 68.2 69.1 69.1 92.4  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (2.0) (0.1) 0.8 (23.5) 12.5
Net purchases, sales, issuances and settlements, assets 1.6 (0.8) (1.7) (1.6) (0.4)
Transfers into Level 3, assets 15.5     12.0 80.3
Transfers out of Level 3, assets       (10.2)  
Ending balance, assets 83.3 68.2 68.2 69.1 92.4
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (2.0) (0.1) (4.1) (21.7) 12.5
Gross purchases, sales, issuances and settlements          
Purchases, assets 2.5        
Settlements, assets (0.9) (0.8) (1.7) (1.6) (0.4)
Net purchases, sales, issuances and settlements, assets 1.6 (0.8) (1.7) (1.6) (0.4)
Corporate debt securities | Available-for-sale          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 2,305.9 1,568.3 1,568.3 834.3 290.8
Total realized/unrealized gains (losses) included in net income, assets (6.8) (3.8) (4.5) (4.8) (21.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (28.9) (10.1) 13.3 (28.6) 7.8
Net purchases, sales, issuances and settlements, assets (100.5) 217.8 593.6 626.3 381.8
Transfers into Level 3, assets 58.9 89.5 212.4 176.3 175.8
Transfers out of Level 3, assets   (42.9) (77.2) (35.2)  
Ending balance, assets 2,228.6 1,818.8 2,305.9 1,568.3 834.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (6.6) (3.8) 0.3 (1.3) (4.6)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (30.3) (9.2) (38.9) (19.8) (0.7)
Gross purchases, sales, issuances and settlements          
Purchases, assets 277.4 273.1 815.2 817.3 626.6
Sales, assets (239.4) (11.7) (27.7) (50.4) (84.3)
Settlements, assets (138.5) (43.6) (193.9) (140.6) (160.5)
Net purchases, sales, issuances and settlements, assets (100.5) 217.8 593.6 626.3 381.8
Commercial mortgage-backed securities | Available-for-sale          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 3.0 3.4 3.4 19.2 13.2
Total realized/unrealized gains (losses) included in net income, assets         (1.0)
Total realized/unrealized gains (losses) included in other comprehensive income, assets       (1.0) (0.4)
Net purchases, sales, issuances and settlements, assets (0.2) (0.2) (0.4) (4.6) 7.4
Transfers out of Level 3, assets       (10.2)  
Ending balance, assets 2.8 3.2 3.0 3.4 19.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets         (1.0)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets       (0.5) (0.4)
Gross purchases, sales, issuances and settlements          
Purchases, assets         7.7
Sales, assets       (4.1)  
Settlements, assets (0.2) (0.2) (0.4) (0.5) (0.3)
Net purchases, sales, issuances and settlements, assets (0.2) (0.2) (0.4) (4.6) 7.4
Collateralized debt obligations | Available-for-sale          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 75.4 56.2 56.2 85.8 27.2
Total realized/unrealized gains (losses) included in net income, assets         (2.0)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (2.8) 0.2 1.9 (1.0) 1.7
Net purchases, sales, issuances and settlements, assets 32.1 145.3 165.8 151.8 397.4
Transfers into Level 3, assets         72.1
Transfers out of Level 3, assets   (136.1) (148.5) (180.4) (410.6)
Ending balance, assets 104.7 65.6 75.4 56.2 85.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets         (2.0)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (3.7) (0.3) 0.7   1.9
Gross purchases, sales, issuances and settlements          
Purchases, assets 32.1 146.5 167.0 151.9 422.7
Settlements, assets   (1.2) (1.2) (0.1) (25.3)
Net purchases, sales, issuances and settlements, assets 32.1 145.3 165.8 151.8 397.4
Other debt obligations | Available-for-sale          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 1,182.6 467.8 467.8 42.1 29.2
Total realized/unrealized gains (losses) included in net income, assets   0.6 1.3 (0.3)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (12.0) (21.1) 1.2 (20.4) 0.4
Net purchases, sales, issuances and settlements, assets 155.3 251.2 537.0 474.2 16.9
Transfers into Level 3, assets 135.6 218.3 239.5   20.6
Transfers out of Level 3, assets (111.6)   (64.2) (27.8) (25.0)
Ending balance, assets 1,349.9 916.8 1,182.6 467.8 42.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   0.6 1.9 1.9 1.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (12.7) (20.0) (29.8) (18.5)  
Gross purchases, sales, issuances and settlements          
Purchases, assets 259.4 260.0 563.3 487.4 45.1
Sales, assets (59.1)     (8.2)  
Settlements, assets (45.0) (8.8) (26.3) (5.0) (28.2)
Net purchases, sales, issuances and settlements, assets 155.3 251.2 537.0 474.2 16.9
Other investments          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 164.6 1.4 1.4 1.4 30.0
Total realized/unrealized gains (losses) included in net income, assets (11.3)   (5.7)   12.4
Net purchases, sales, issuances and settlements, assets 19.8   168.9   (41.0)
Ending balance, assets 173.1 1.4 164.6 1.4 1.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (6.6)   (5.2)   12.5
Gross purchases, sales, issuances and settlements          
Purchases, assets 118.7   194.2    
Sales, assets         (41.0)
Settlements, assets (98.9)   (25.3)    
Net purchases, sales, issuances and settlements, assets 19.8   168.9   (41.0)
Separate account assets          
Changes in Level 3 fair value measurements rollforward, assets and liabilities          
Beginning balance, assets 752.8 1,034.1 1,034.1 946.0 8,893.2
Total realized/unrealized gains (losses) included in net income, assets (32.6) 0.4 (7.9) 112.0 313.8
Net purchases, sales, issuances and settlements, assets (1.8) (195.7) (273.4) (23.9) (8,261.0)
Ending balance, assets 718.4 838.8 752.8 1,034.1 946.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (19.1) (38.2) (80.3) 89.8 90.5
Gross purchases, sales, issuances and settlements          
Purchases, assets       11.8 38.5
Sales, assets (30.3) (223.6) (286.3) (4.5) (8,206.2)
Issuances, assets (10.5) (29.3) (109.1) (50.0) (191.5)
Settlements, assets 39.0 57.2 122.0 18.8 98.2
Net purchases, sales, issuances and settlements, assets $ (1.8) $ (195.7) $ (273.4) $ (23.9) $ (8,261.0)