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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Changes in unrealized gains (losses) included in OCI relating to positions still held, derivative assets       $ (0.2)
Recurring Fair Value Measurements        
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) $ 4.0 $ (0.7) $ (3.4)  
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) $ (4.8) $ (0.6) $ 2.6 $ (2.0)
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
Total realized/unrealized gains (losses) included in other comprehensive income, net derivative assets (liabilities)   $ (0.3)   $ (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) $ 1.0 $ 1.7 $ 1.0 $ 2.4
Transfers out of Level 3, net derivative assets (liabilities)   (0.3)   (0.3)
Ending balance, net derivative assets (liabilities) 0.2 (0.2) 0.2 (0.2)
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (3.1) 1.0 4.2 (0.2)
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) 1.0 1.7 1.0 2.4
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 1.0 1.7 1.0 2.4
Recurring Fair Value Measurements | Investment and universal life contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (55.5) (68.7) (46.4) (83.2)
Total realized/unrealized gains (losses) included in net income, liabilities (13.0) 23.5 (18.3) 31.6
Net purchases, sales, issuances and settlements, liabilities (1.1) (0.1) (4.9) 6.3
Ending balance, liabilities (69.6) (45.3) (69.6) (45.3)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (13.7) 19.8 (17.7) 27.3
Gross purchases, sales, issuances and settlements        
Issuances, liabilities (10.7) (5.4) (18.9) (12.1)
Settlements, liabilities 9.6 5.3 14.0 18.4
Net purchases, sales, issuances and settlements, liabilities (1.1) (0.1) (4.9) 6.3
Recurring Fair Value Measurements | Funds withheld payable embedded derivative        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 3,026.2      
Total realized/unrealized gains (losses) included in net income, assets 93.9   (532.7) 3,067.3
Ending balance, assets 3,120.1 3,067.3 3,120.1 3,067.3
Beginning balance, liabilities     3,652.8  
Total realized/unrealized gains (losses) included in net income, liabilities   3,067.3    
Ending balance, liabilities 3,120.1 3,067.3 3,120.1 3,067.3
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 93.9 3,067.3 (532.7) 3,067.3
Recurring Fair Value Measurements | Fixed maturities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 2,758.6 1,331.6 2,166.6 1,076.2
Total realized/unrealized gains (losses) included in net income, assets (3.2) (0.4) (3.2) (3.4)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (20.8) (41.5) (31.1) (47.9)
Net purchases, sales, issuances and settlements, assets 181.6 124.0 613.3 317.6
Transfers into Level 3, assets 79.1 13.1 307.8 188.3
Transfers out of Level 3, assets (120.9) (65.5) (179.0) (169.5)
Ending balance, assets 2,874.4 1,361.3 2,874.4 1,361.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.2)   (3.2)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (16.3) (41.8) (23.0) (48.2)
Gross purchases, sales, issuances and settlements        
Purchases, assets 216.5 160.0 679.6 406.4
Sales, assets (8.1) (9.1) (11.7) (29.5)
Settlements, assets (26.8) (26.9) (54.6) (59.3)
Net purchases, sales, issuances and settlements, assets 181.6 124.0 613.3 317.6
Recurring Fair Value Measurements | Fixed maturities | Trading        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 156.1 62.4 134.0 4.9
Total realized/unrealized gains (losses) included in net income, assets (0.3) (0.5) (0.7) (0.5)
Net purchases, sales, issuances and settlements, assets 15.2 23.8 37.7 52.3
Transfers into Level 3, assets       29.0
Ending balance, assets 171.0 85.7 171.0 85.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.4) (0.5) (0.8) (0.5)
Gross purchases, sales, issuances and settlements        
Purchases, assets 15.8 24.0   52.5
Sales, assets (0.1)      
Settlements, assets (0.5) (0.2)   (0.2)
Net purchases, sales, issuances and settlements, assets 15.2 23.8 37.7 52.3
Recurring Fair Value Measurements | States and political subdivisions | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 72.1 94.5 70.9 94.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.7) (19.4) (0.1) (19.3)
Net purchases, sales, issuances and settlements, assets (0.4) (0.4) (0.8) (0.8)
Transfers into Level 3, assets   12.0   12.0
Ending balance, assets 70.0 86.7 70.0 86.7
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (1.7) (19.5) (0.1) (19.4)
Gross purchases, sales, issuances and settlements        
Settlements, assets (0.4) (0.4) (0.8) (0.8)
Net purchases, sales, issuances and settlements, assets (0.4) (0.4) (0.8) (0.8)
Recurring Fair Value Measurements | Corporate debt securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,654.5 1,140.8 1,568.3 834.3
Total realized/unrealized gains (losses) included in net income, assets (3.8) (0.4) (3.8) (3.4)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (3.5) (21.9) (10.1) (26.6)
Net purchases, sales, issuances and settlements, assets 92.5 129.1 217.8 268.1
Transfers into Level 3, assets 79.1 1.1 89.5 176.3
Transfers out of Level 3, assets     (42.9)  
Ending balance, assets 1,818.8 1,248.7 1,818.8 1,248.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.8)   (3.8)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (1.0) (21.9) (9.2) (27.4)
Gross purchases, sales, issuances and settlements        
Purchases, assets 122.2 160.0 273.1 350.9
Sales, assets (8.1) (4.9) (11.7) (25.3)
Settlements, assets (21.6) (26.0) (43.6) (57.5)
Net purchases, sales, issuances and settlements, assets 92.5 129.1 217.8 268.1
Recurring Fair Value Measurements | Commercial mortgage-backed securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 3.3 18.1 3.4 19.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1) 0.2   (0.7)
Net purchases, sales, issuances and settlements, assets   (4.3) (0.2) (4.5)
Transfers out of Level 3, assets   (10.2)   (10.2)
Ending balance, assets 3.2 3.8 3.2 3.8
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets   (0.1)   (0.3)
Gross purchases, sales, issuances and settlements        
Sales, assets   (4.2)   (4.2)
Settlements, assets   (0.1) (0.2) (0.3)
Net purchases, sales, issuances and settlements, assets   (4.3) (0.2) (4.5)
Recurring Fair Value Measurements | Collateralized debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 162.2 57.0 56.2 85.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.9) (0.4) 0.2 (0.7)
Net purchases, sales, issuances and settlements, assets 25.2   145.3 55.5
Transfers out of Level 3, assets (120.9) (55.3) (136.1) (139.3)
Ending balance, assets 65.6 1.3 65.6 1.3
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.2) (0.3) (0.3) (0.5)
Gross purchases, sales, issuances and settlements        
Purchases, assets 25.2   146.5 55.5
Settlements, assets     (1.2)  
Net purchases, sales, issuances and settlements, assets 25.2   145.3 55.5
Recurring Fair Value Measurements | Other debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 866.5 21.2 467.8 42.1
Total realized/unrealized gains (losses) included in net income, assets 0.6   0.6  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (14.6)   (21.1) (0.6)
Net purchases, sales, issuances and settlements, assets 64.3 (0.4) 251.2 (0.7)
Transfers into Level 3, assets     218.3  
Transfers out of Level 3, assets       (20.0)
Ending balance, assets 916.8 20.8 916.8 20.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 0.6   0.6  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (13.4)   (13.4) (0.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets 69.1   260.0  
Settlements, assets (4.8) (0.4) (8.8) (0.7)
Net purchases, sales, issuances and settlements, assets 64.3 (0.4) 251.2 (0.7)
Recurring Fair Value Measurements | 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 other comprehensive income, assets       (0.7)
Ending balance, assets 1.9 1.4 1.9 1.4
Recurring Fair Value Measurements | Fixed maturities, trading.        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Net purchases, sales, issuances and settlements, assets     37.7  
Gross purchases, sales, issuances and settlements        
Purchases, assets     42.2  
Sales, assets     (3.6)  
Settlements, assets     (0.9)  
Net purchases, sales, issuances and settlements, assets     37.7  
Recurring Fair Value Measurements | Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 893.8 1,015.4 1,034.9 945.3
Total realized/unrealized gains (losses) included in net income, assets (16.1) 44.3 (1.1) 115.7
Net purchases, sales, issuances and settlements, assets (39.6) (1.1) (195.7) (2.4)
Ending balance, assets 838.1 1,058.6 838.1 1,058.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (30.9) 44.5 (38.2) 112.8
Gross purchases, sales, issuances and settlements        
Sales, assets (21.6)   (223.6)  
Issuances, assets (25.2) (0.8) (29.3) (1.9)
Settlements, assets 7.2 (0.3) 57.2 (0.5)
Net purchases, sales, issuances and settlements, assets $ (39.6) $ (1.1) $ (195.7) $ (2.4)