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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
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
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
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
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
Beginning balance, net derivative assets (liabilities) $ 0.2 $ (0.2) $ (3.4)  
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) $ (20.6) $ (17.7) $ (18.0) $ (19.7)
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
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
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) $ 3.0 $ 0.5 $ 4.0 $ 2.9
Transfers into Level 3, net derivative assets (liabilities) 0.1   0.1  
Transfers out of Level 3, net derivative assets (liabilities)       (0.3)
Ending balance, net derivative assets (liabilities) (17.3) (17.4) (17.3) (17.4)
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (15.7) (22.9) (14.9) (17.3)
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) 0.4   0.4  
Sales, net derivative assets (liabilities) 2.6 0.5 3.6 2.9
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 3.0 0.5 4.0 2.9
Investment and universal life contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (69.6) (45.3) (46.4) (83.2)
Total realized/unrealized gains (losses) included in net income, liabilities 3.5 6.4 (14.8) 38.0
Net purchases, sales, issuances and settlements, liabilities (12.7) (2.2) (17.6) 4.1
Ending balance, liabilities (78.8) (41.1) (78.8) (41.1)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 1.5 4.6 (11.1) 29.1
Gross purchases, sales, issuances and settlements        
Issuances, liabilities (22.6) (4.4) (41.5) (16.5)
Settlements, liabilities 9.9 2.2 23.9 20.6
Net purchases, sales, issuances and settlements, liabilities (12.7) (2.2) (17.6) 4.1
Funds withheld payable embedded derivative        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities 3,120.1 3,067.3 3,652.8  
Total realized/unrealized gains (losses) included in net income, liabilities 925.6 1,237.7 392.9 4,305.0
Ending balance, liabilities 4,045.7 4,305.0 4,045.7 4,305.0
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 925.6 1,237.7 392.9 4,305.0
Fixed maturities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 2,874.4 1,361.3 2,166.6 1,076.2
Total realized/unrealized gains (losses) included in net income, assets (1.6)   (4.8) (3.4)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (46.7) (18.5) (77.8) (66.4)
Net purchases, sales, issuances and settlements, assets 328.9 513.0 942.2 830.6
Transfers into Level 3, assets 103.4   411.2 188.3
Transfers out of Level 3, assets (44.2) (11.2) (223.2) (180.7)
Ending balance, assets 3,214.2 1,844.6 3,214.2 1,844.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.6)   (5.3)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (47.7) (18.7) (74.7) (65.9)
Gross purchases, sales, issuances and settlements        
Purchases, assets 395.4 592.3 1,075.0 998.7
Sales, assets (4.4) (11.2) (16.1) (40.7)
Settlements, assets (62.1) (68.1) (116.7) (127.4)
Net purchases, sales, issuances and settlements, assets 328.9 513.0 942.2 830.6
States and political subdivisions | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 70.0 86.7 70.9 94.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets (4.3) (4.5) (4.4) (23.8)
Net purchases, sales, issuances and settlements, assets (0.5) (0.4) (1.3) (1.2)
Transfers into Level 3, assets       12.0
Transfers out of Level 3, assets   (10.2)   (10.2)
Ending balance, assets 65.2 71.6 65.2 71.6
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (4.4) (4.4) (4.5) (22.0)
Gross purchases, sales, issuances and settlements        
Settlements, assets (0.5) (0.4) (1.3) (1.2)
Net purchases, sales, issuances and settlements, assets (0.5) (0.4) (1.3) (1.2)
Corporate debt securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,818.8 1,248.7 1,568.3 834.3
Total realized/unrealized gains (losses) included in net income, assets     (3.8) (3.4)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (32.5) (1.5) (42.6) (28.1)
Net purchases, sales, issuances and settlements, assets 197.7 232.3 415.5 500.4
Transfers into Level 3, assets 82.2   171.7 176.3
Transfers out of Level 3, assets (34.3)   (77.2)  
Ending balance, assets 2,031.9 1,479.5 2,031.9 1,479.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets     (3.7)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (33.5) (1.7) (41.1) (29.8)
Gross purchases, sales, issuances and settlements        
Purchases, assets 261.6 308.2 534.7 659.1
Sales, assets (4.4) (11.2) (16.1) (36.5)
Settlements, assets (59.5) (64.7) (103.1) (122.2)
Net purchases, sales, issuances and settlements, assets 197.7 232.3 415.5 500.4
Commercial mortgage-backed securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 3.2 3.8 3.4 19.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.3)   (1.0)
Net purchases, sales, issuances and settlements, assets (0.1) (0.1) (0.3) (4.6)
Transfers out of Level 3, assets       (10.2)
Ending balance, assets 3.1 3.4 3.1 3.4
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets   (0.3)   (0.6)
Gross purchases, sales, issuances and settlements        
Sales, assets       (4.2)
Settlements, assets (0.1) (0.1) (0.3) (0.4)
Net purchases, sales, issuances and settlements, assets (0.1) (0.1) (0.3) (4.6)
Collateralized debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 65.6 1.3 56.2 85.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.5) (0.7) (0.3) (1.4)
Net purchases, sales, issuances and settlements, assets 2.5 42.1 147.8 97.6
Transfers out of Level 3, assets (9.9)   (146.0) (139.3)
Ending balance, assets 57.7 42.7 57.7 42.7
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.5) (0.8) 0.7 (1.3)
Gross purchases, sales, issuances and settlements        
Purchases, assets 2.5 42.1 149.0 97.6
Settlements, assets     (1.2)  
Net purchases, sales, issuances and settlements, assets 2.5 42.1 147.8 97.6
Other debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 916.8 20.8 467.8 42.1
Total realized/unrealized gains (losses) included in net income, assets (1.6)   (1.0)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (9.4) (11.5) (30.5) (12.1)
Net purchases, sales, issuances and settlements, assets 129.3 239.1 380.5 238.4
Transfers into Level 3, assets 21.2   239.5  
Transfers out of Level 3, assets   (1.0)   (21.0)
Ending balance, assets 1,056.3 247.4 1,056.3 247.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.6)   (1.6)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (9.3) (11.5) (29.8) (12.2)
Gross purchases, sales, issuances and settlements        
Purchases, assets 131.3 242.0 391.3 242.0
Settlements, assets (2.0) (2.9) (10.8) (3.6)
Net purchases, sales, issuances and settlements, assets 129.3 239.1 380.5 238.4
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1.9 1.4 1.9 2.1
Total realized/unrealized gains (losses) included in net income, assets (0.1)   (0.1)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets       (0.7)
Net purchases, sales, issuances and settlements, assets 103.4   103.4  
Ending balance, assets 105.2 1.4 105.2 1.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1)   (0.1)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 103.4   103.4  
Net purchases, sales, issuances and settlements, assets 103.4   103.4  
Fixed maturities, trading.        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 171.0 85.7 134.0 4.9
Total realized/unrealized gains (losses) included in net income, assets (3.2) 0.1 (3.9) (0.4)
Net purchases, sales, issuances and settlements, assets 127.3 38.1 165.0 90.4
Transfers into Level 3, assets       29.0
Ending balance, assets 295.1 123.9 295.1 123.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.3) (0.4) (4.0) (0.4)
Gross purchases, sales, issuances and settlements        
Purchases, assets 142.9 38.1 185.1 90.6
Sales, assets (8.7)   (12.3)  
Settlements, assets (6.9)   (7.8) (0.2)
Net purchases, sales, issuances and settlements, assets 127.3 38.1 165.0 90.4
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 838.1 1,058.6 1,034.9 945.3
Total realized/unrealized gains (losses) included in net income, assets (3.2) 23.1 (4.3) 138.8
Net purchases, sales, issuances and settlements, assets (70.4) (0.3) (266.1) (2.7)
Ending balance, assets 764.5 1,081.4 764.5 1,081.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (17.8) 13.1 (76.2) 126.0
Gross purchases, sales, issuances and settlements        
Sales, assets (62.7)   (286.3)  
Issuances, assets (8.1) (0.1) (37.4) (2.0)
Settlements, assets 0.4 (0.2) 57.6 (0.7)
Net purchases, sales, issuances and settlements, assets $ (70.4) $ (0.3) $ (266.1) $ (2.7)