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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, 2022
Dec. 31, 2021
Dec. 31, 2020
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)   $ (5.1) $ 13.0
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) $ (5.4) $ (6.9) $ 11.8
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) $ 2.6 $ 12.0 $ (3.4)
Transfers out of Level 3, net derivative assets (liabilities) (0.3)   (26.5)
Ending balance, net derivative assets (liabilities) (3.4)   (5.1)
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (3.4) (0.6) 9.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, derivative assets (0.2)    
Gross purchases, sales, issuances and settlements      
Sales, net derivative assets (liabilities) 2.6 12.0 (3.4)
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 2.6 12.0 (3.4)
Investment and universal life contracts      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities (356.3) (467.8) (214.2)
Total realized/unrealized gains (losses) included in net income, liabilities 369.0 81.7 (254.9)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.1 0.2 (0.3)
Net purchases, sales, issuances and settlements, liabilities 19.0 29.6 1.6
Ending balance, liabilities 31.8 (356.3) (467.8)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 354.7 80.3 (262.1)
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities 0.1 0.2 (0.3)
Gross purchases, sales, issuances and settlements      
Issuances, liabilities (7.4) (16.4) (23.0)
Settlements, liabilities 26.4 46.0 24.6
Net purchases, sales, issuances and settlements, liabilities 19.0 29.6 1.6
Funds withheld payable embedded derivative      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Total realized/unrealized gains (losses) included in net income, assets 3,652.8    
Ending balance, assets 3,652.8    
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 3,652.8    
Fixed maturities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 1,076.2 360.4 384.9
Total realized/unrealized gains (losses) included in net income, assets (5.1) (24.9) (4.5)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (75.1) 22.2 (16.7)
Net purchases, sales, issuances and settlements, assets 1,246.1 826.4 263.0
Transfers into Level 3, assets 188.3 352.9 388.4
Transfers out of Level 3, assets (263.8) (460.8) (654.7)
Ending balance, assets 2,166.6 1,076.2 360.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.3) (7.6) (3.4)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (61.1) 13.6 13.1
Gross purchases, sales, issuances and settlements      
Purchases, assets 1,456.6 1,125.4 366.0
Sales, assets (62.7) (84.3) (5.5)
Settlements, assets (147.8) (214.7) (97.5)
Net purchases, sales, issuances and settlements, assets 1,246.1 826.4 263.0
Fixed maturities | Trading      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 4.9   0.3
Total realized/unrealized gains (losses) included in net income, assets (0.6)    
Net purchases, sales, issuances and settlements, assets 100.7 4.9  
Transfers into Level 3, assets 29.0    
Transfers out of Level 3, assets     (0.3)
Ending balance, assets 134.0 4.9  
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.6)    
Gross purchases, sales, issuances and settlements      
Purchases, assets 134.7 4.9  
Sales, assets (32.6)    
Settlements, assets (1.4)    
Net purchases, sales, issuances and settlements, assets 100.7 4.9  
States and political subdivisions | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 94.8    
Total realized/unrealized gains (losses) included in other comprehensive income, assets (24.1) 12.8  
Net purchases, sales, issuances and settlements, assets (1.6) (0.4)  
Transfers into Level 3, assets 12.0 82.4  
Transfers out of Level 3, assets (10.2)    
Ending balance, assets 70.9 94.8  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (22.3) 12.8  
Gross purchases, sales, issuances and settlements      
Settlements, assets (1.6) (0.4)  
Net purchases, sales, issuances and settlements, assets (1.6) (0.4)  
Corporate debt securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 834.3 290.8 81.7
Total realized/unrealized gains (losses) included in net income, assets (4.8) (21.9) (0.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (28.6) 7.8 5.2
Net purchases, sales, issuances and settlements, assets 626.3 381.8 118.0
Transfers into Level 3, assets 176.3 175.8 342.0
Transfers out of Level 3, assets (35.2)   (255.2)
Ending balance, assets 1,568.3 834.3 290.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.3) (4.6)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (19.8) (0.7) 11.9
Gross purchases, sales, issuances and settlements      
Purchases, assets 817.3 626.6 169.2
Sales, assets (50.4) (84.3) (5.5)
Settlements, assets (140.6) (160.5) (45.7)
Net purchases, sales, issuances and settlements, assets 626.3 381.8 118.0
Commercial mortgage-backed securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 19.2 13.2 12.9
Total realized/unrealized gains (losses) included in net income, assets   (1.0) (1.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.0) (0.4) 1.4
Net purchases, sales, issuances and settlements, assets (4.6) 7.4 (0.1)
Transfers into Level 3, assets     0.3
Transfers out of Level 3, assets (10.2)    
Ending balance, assets 3.4 19.2 13.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (1.0) (1.2)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.5) (0.4) 1.5
Gross purchases, sales, issuances and settlements      
Purchases, assets   7.7  
Sales, assets (4.1)    
Settlements, assets (0.5) (0.3) (0.1)
Net purchases, sales, issuances and settlements, assets (4.6) 7.4 (0.1)
Collateralized debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 85.8 27.2 199.0
Total realized/unrealized gains (losses) included in net income, assets   (2.0) (2.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.0) 1.6 (21.9)
Net purchases, sales, issuances and settlements, assets 151.8 420.7 183.0
Transfers into Level 3, assets   74.1  
Transfers out of Level 3, assets (180.4) (435.8) (330.6)
Ending balance, assets 56.2 85.8 27.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (2.0) (2.2)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets   1.9 (0.3)
Gross purchases, sales, issuances and settlements      
Purchases, assets 151.9 446.0 182.5
Settlements, assets (0.1) (25.3) 0.5
Net purchases, sales, issuances and settlements, assets 151.8 420.7 183.0
Other debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 42.1 29.2 91.3
Total realized/unrealized gains (losses) included in net income, assets (0.3)    
Total realized/unrealized gains (losses) included in other comprehensive income, assets (20.4) 0.4 (1.4)
Net purchases, sales, issuances and settlements, assets 474.2 16.9 (37.9)
Transfers into Level 3, assets   20.6 46.1
Transfers out of Level 3, assets (27.8) (25.0) (68.9)
Ending balance, assets 467.8 42.1 29.2
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (18.5)    
Gross purchases, sales, issuances and settlements      
Purchases, assets 487.4 45.1 14.3
Sales, assets (8.2)    
Settlements, assets (5.0) (28.2) (52.2)
Net purchases, sales, issuances and settlements, assets 474.2 16.9 (37.9)
Other investments      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 2.1 31.9 39.0
Total realized/unrealized gains (losses) included in net income, assets   12.5 6.3
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.6) (1.3) (2.9)
Net purchases, sales, issuances and settlements, assets 0.4 (41.0) (10.5)
Ending balance, assets 1.9 2.1 31.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   12.5 5.3
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets   (1.3) (2.9)
Gross purchases, sales, issuances and settlements      
Purchases, assets 0.4   0.5
Sales, assets   (41.0) (11.0)
Net purchases, sales, issuances and settlements, assets 0.4 (41.0) (10.5)
Separate account assets      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 945.3 8,893.2 8,968.0
Total realized/unrealized gains (losses) included in net income, assets 113.5 313.1 463.7
Net purchases, sales, issuances and settlements, assets (23.9) (8,261.0) (538.5)
Ending balance, assets 1,034.9 945.3 8,893.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 89.8 90.5 385.5
Gross purchases, sales, issuances and settlements      
Purchases, assets 11.8 38.5 309.2
Sales, assets (4.5) (8,206.2) (658.2)
Issuances, assets (50.0) (191.5) (396.1)
Settlements, assets 18.8 98.2 206.6
Net purchases, sales, issuances and settlements, assets $ (23.9) $ (8,261.0) $ (538.5)