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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
12 Months Ended
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
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
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
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
Beginning balance, net derivative assets (liabilities) $ (3.4)   $ (5.1)
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) $ 3.9 $ (5.4) $ (6.9)
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
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
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) $ 4.9 $ 2.6 $ 12.0
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) 5.5 (3.4)  
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) 7.5 (3.4) (0.6)
Changes in unrealized gains (losses) included in OCI relating to positions still held, derivative assets   (0.2)  
Gross purchases, sales, issuances and settlements      
Purchases, net derivative assets (liabilities) (0.8)    
Sales, net derivative assets (liabilities) 4.1 2.6 12.0
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 4.9 2.6 12.0
Investment and universal life contracts      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities (46.4) (83.2) (90.8)
Total realized/unrealized gains (losses) included in net income, liabilities (37.7) 35.9 (15.6)
Net purchases, sales, issuances and settlements, liabilities (31.4) 0.9 23.2
Ending balance, liabilities (115.5) (46.4) (83.2)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (29.2) 22.6 (8.6)
Gross purchases, sales, issuances and settlements      
Issuances, liabilities (69.9) (22.2) (19.5)
Settlements, liabilities 38.5 23.1 42.7
Net purchases, sales, issuances and settlements, liabilities (31.4) 0.9 23.2
Funds withheld payable embedded derivative      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 3,652.8    
Total realized/unrealized gains (losses) included in net income, assets (1,085.7) 3,652.8  
Ending balance, assets 2,567.1 3,652.8  
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (1,085.7) 3,652.8  
Fixed maturities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 2,166.6 1,076.2 360.4
Total realized/unrealized gains (losses) included in net income, assets (3.2) (5.1) (24.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 17.1 (75.1) 22.2
Net purchases, sales, issuances and settlements, assets 1,294.3 1,246.1 826.4
Transfers into Level 3, assets 451.9 188.3 352.9
Transfers out of Level 3, assets (289.9) (263.8) (460.8)
Ending balance, assets 3,636.8 2,166.6 1,076.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 2.2 (1.3) (7.6)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (72.1) (61.1) 13.6
Gross purchases, sales, issuances and settlements      
Purchases, assets 1,545.5 1,456.6 1,125.4
Sales, assets (27.7) (62.7) (84.3)
Settlements, assets (223.5) (147.8) (214.7)
Net purchases, sales, issuances and settlements, assets 1,294.3 1,246.1 826.4
States and political subdivisions | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 70.9 94.8  
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.7 (24.1) 12.8
Net purchases, sales, issuances and settlements, assets (1.7) (1.6) (0.4)
Transfers into Level 3, assets   12.0 82.4
Transfers out of Level 3, assets   (10.2)  
Ending balance, assets 69.9 70.9 94.8
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (4.1) (22.3) 12.8
Gross purchases, sales, issuances and settlements      
Settlements, assets (1.7) (1.6) (0.4)
Net purchases, sales, issuances and settlements, assets (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 1,568.3 834.3 290.8
Total realized/unrealized gains (losses) included in net income, assets (4.5) (4.8) (21.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 13.3 (28.6) 7.8
Net purchases, sales, issuances and settlements, assets 593.6 626.3 381.8
Transfers into Level 3, assets 212.4 176.3 175.8
Transfers out of Level 3, assets (77.2) (35.2)  
Ending balance, assets 2,305.9 1,568.3 834.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 0.3 (1.3) (4.6)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (38.9) (19.8) (0.7)
Gross purchases, sales, issuances and settlements      
Purchases, assets 815.2 817.3 626.6
Sales, assets (27.7) (50.4) (84.3)
Settlements, assets (193.9) (140.6) (160.5)
Net purchases, sales, issuances and settlements, assets 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 3.4 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 (0.4) (4.6) 7.4
Transfers out of Level 3, assets   (10.2)  
Ending balance, assets 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 (0.4) (0.5) (0.3)
Net purchases, sales, issuances and settlements, assets (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 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 1.9 (1.0) 1.6
Net purchases, sales, issuances and settlements, assets 165.8 151.8 420.7
Transfers into Level 3, assets     74.1
Transfers out of Level 3, assets (148.5) (180.4) (435.8)
Ending balance, assets 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 0.7   1.9
Gross purchases, sales, issuances and settlements      
Purchases, assets 167.0 151.9 446.0
Settlements, assets (1.2) (0.1) (25.3)
Net purchases, sales, issuances and settlements, assets 165.8 151.8 420.7
Other debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 467.8 42.1 29.2
Total realized/unrealized gains (losses) included in net income, assets 1.3 (0.3)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets 1.2 (20.4) 0.4
Net purchases, sales, issuances and settlements, assets 537.0 474.2 16.9
Transfers into Level 3, assets 239.5   20.6
Transfers out of Level 3, assets (64.2) (27.8) (25.0)
Ending balance, assets 1,182.6 467.8 42.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 1.9    
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (29.8) (18.5)  
Gross purchases, sales, issuances and settlements      
Purchases, assets 563.3 487.4 45.1
Sales, assets   (8.2)  
Settlements, assets (26.3) (5.0) (28.2)
Net purchases, sales, issuances and settlements, assets 537.0 474.2 16.9
Other investments      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 1.9 2.1 31.9
Total realized/unrealized gains (losses) included in net income, assets (5.7)   12.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.6) (1.3)
Net purchases, sales, issuances and settlements, assets 168.9 0.4 (41.0)
Ending balance, assets 165.1 1.9 2.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (5.2)   12.5
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets     (1.3)
Gross purchases, sales, issuances and settlements      
Purchases, assets 194.2 0.4  
Sales, assets     (41.0)
Settlements, assets (25.3)    
Net purchases, sales, issuances and settlements, assets 168.9 0.4 (41.0)
Fixed maturities, trading.      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 134.0 4.9  
Total realized/unrealized gains (losses) included in net income, assets 2.4 (0.6)  
Net purchases, sales, issuances and settlements, assets 279.4 100.7 4.9
Transfers into Level 3, assets   29.0  
Ending balance, assets 415.8 134.0 4.9
Gross purchases, sales, issuances and settlements      
Purchases, assets 439.3 134.7 4.9
Sales, assets (145.2) (32.6)  
Settlements, assets (14.7) (1.4)  
Net purchases, sales, issuances and settlements, assets 279.4 100.7 4.9
Fixed maturities, trading. | Trading      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 2.0 (0.6)  
Separate account assets      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 1,034.9 945.3 8,893.2
Total realized/unrealized gains (losses) included in net income, assets (8.7) 113.5 313.1
Net purchases, sales, issuances and settlements, assets (273.4) (23.9) (8,261.0)
Ending balance, assets 752.8 1,034.9 945.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (80.3) 89.8 90.5
Gross purchases, sales, issuances and settlements      
Purchases, assets   11.8 38.5
Sales, assets (286.3) (4.5) (8,206.2)
Issuances, assets (109.1) (50.0) (191.5)
Settlements, assets 122.0 18.8 98.2
Net purchases, sales, issuances and settlements, assets $ (273.4) $ (23.9) $ (8,261.0)