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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 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 Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets
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 Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets
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) $ (8.9) $ 0.0 $ (5.1)
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) $ (17.7) $ (1.8) $ (19.7) $ (6.2)
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 Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative, Gain Loss On Funds Withheld Assets
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) $ 0.5 $ 10.7 $ 2.9 $ 11.3
Transfers out of Level 3, net derivative assets (liabilities)     (0.3)  
Ending balance, net derivative assets (liabilities) (17.4)   (17.4)  
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (22.9) (0.7) (17.3) (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        
Sales, net derivative assets (liabilities) 0.5 10.7 2.9 11.3
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 0.5 10.7 2.9 11.3
Investment and universal life contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (75.5) (281.6) (356.3) (467.8)
Total realized/unrealized gains (losses) included in net income, liabilities 46.2 (80.4) 314.4 89.3
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities   0.1 0.2 0.2
Net purchases, sales, issuances and settlements, liabilities 3.4 6.6 15.8 23.0
Ending balance, liabilities (25.9) (355.3) (25.9) (355.3)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 44.7 (76.4) 303.8 86.1
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities   0.1 0.2 0.2
Gross purchases, sales, issuances and settlements        
Issuances, liabilities 0.1 (3.5) (7.0) (11.7)
Settlements, liabilities 3.3 10.1 22.8 34.7
Net purchases, sales, issuances and settlements, liabilities 3.4 6.6 15.8 23.0
Funds withheld payable embedded derivative        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities 3,067.3   0.0  
Total realized/unrealized gains (losses) included in net income, liabilities 1,237.7   4,305.0  
Ending balance, liabilities 4,305.0   4,305.0  
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 1,237.7   4,305.0  
Fixed maturities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,361.3 817.6 1,076.2 360.4
Total realized/unrealized gains (losses) included in net income, assets   (7.8) (3.4) (15.7)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (18.5) 10.2 (66.4) 7.6
Net purchases, sales, issuances and settlements, assets 513.0 245.3 830.6 691.2
Transfers into Level 3, assets   25.1 188.3 272.3
Transfers out of Level 3, assets (11.2) (197.8) (180.7) (423.2)
Ending balance, assets 1,844.6 892.6 1,844.6 892.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (7.8)   (14.6)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (18.7) 10.4 (65.2) 5.9
Gross purchases, sales, issuances and settlements        
Purchases, assets 592.3 298.8 998.7 859.1
Sales, assets (11.2) (3.4) (40.7) (14.3)
Settlements, assets (68.1) (50.1) (127.4) (153.6)
Net purchases, sales, issuances and settlements, assets 513.0 245.3 830.6 691.2
Fixed maturities | Trading        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 85.7   4.9  
Total realized/unrealized gains (losses) included in net income, assets 0.1   (0.4)  
Net purchases, sales, issuances and settlements, assets 38.1   90.4  
Transfers into Level 3, assets     29.0  
Ending balance, assets 123.9   123.9  
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.4)   (0.4)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 38.1   90.6  
Settlements, assets     (0.2)  
Net purchases, sales, issuances and settlements, assets 38.1   90.4  
States and political subdivisions | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 86.7   94.8  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (4.5)   (23.8)  
Net purchases, sales, issuances and settlements, assets (0.4)   (1.2)  
Transfers into Level 3, assets     12.0  
Transfers out of Level 3, assets (10.2)   (10.2)  
Ending balance, assets 71.6   71.6  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (4.4)   (22.0)  
Gross purchases, sales, issuances and settlements        
Settlements, assets (0.4)   (1.2)  
Net purchases, sales, issuances and settlements, assets (0.4)   (1.2)  
Corporate debt securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,248.7 549.0 834.3 290.8
Total realized/unrealized gains (losses) included in net income, assets   (7.8) (3.4) (12.7)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.5) 10.5 (28.1) 5.8
Net purchases, sales, issuances and settlements, assets 232.3 229.0 500.4 354.3
Transfers into Level 3, assets   25.1 176.3 167.6
Ending balance, assets 1,479.5 805.8 1,479.5 805.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (7.8)   (12.6)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (1.7) 10.6 (29.8) 4.4
Gross purchases, sales, issuances and settlements        
Purchases, assets 308.2 268.5 659.1 469.3
Sales, assets (11.2) (3.4) (36.5) (14.3)
Settlements, assets (64.7) (36.1) (122.2) (100.7)
Net purchases, sales, issuances and settlements, assets 232.3 229.0 500.4 354.3
Commercial mortgage-backed securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 3.8 11.6 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 (0.3) (0.1) (1.0) (0.6)
Net purchases, sales, issuances and settlements, assets (0.1) 2.7 (4.6) 2.6
Transfers out of Level 3, assets     (10.2)  
Ending balance, assets 3.4 14.2 3.4 14.2
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.3) (0.2) (0.6) (0.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets   2.7   2.7
Sales, assets     (4.2)  
Settlements, assets (0.1)   (0.4) (0.1)
Net purchases, sales, issuances and settlements, assets (0.1) 2.7 (4.6) 2.6
Collateralized debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1.3 195.6 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 (0.7)   (1.4) 1.8
Net purchases, sales, issuances and settlements, assets 42.1 27.6 97.6 337.5
Transfers into Level 3, assets       84.1
Transfers out of Level 3, assets   (172.8) (139.3) (398.2)
Ending balance, assets 42.7 50.4 42.7 50.4
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 (0.8)   (1.3) 2.1
Gross purchases, sales, issuances and settlements        
Purchases, assets 42.1 27.6 97.6 362.0
Settlements, assets       (24.5)
Net purchases, sales, issuances and settlements, assets 42.1 27.6 97.6 337.5
Other debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 20.8 61.4 42.1 29.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets (11.5) (0.2) (12.1) 0.6
Net purchases, sales, issuances and settlements, assets 239.1 (14.0) 238.4 (3.2)
Transfers into Level 3, assets       20.6
Transfers out of Level 3, assets (1.0) (25.0) (21.0) (25.0)
Ending balance, assets 247.4 22.2 247.4 22.2
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (11.5)   (11.5)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 242.0   242.0 25.1
Settlements, assets (2.9) (14.0) (3.6) (28.3)
Net purchases, sales, issuances and settlements, assets 239.1 (14.0) 238.4 (3.2)
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1.4 44.5 2.1 31.9
Total realized/unrealized gains (losses) included in net income, assets   (0.1)   12.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.6) (0.7) (0.6)
Net purchases, sales, issuances and settlements, assets   (41.1)   (41.1)
Ending balance, assets 1.4 2.7 1.4 2.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.1)   12.6
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets   (0.6)   (0.6)
Gross purchases, sales, issuances and settlements        
Sales, assets   (41.1)   (41.1)
Net purchases, sales, issuances and settlements, assets   (41.1)   (41.1)
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,058.6 1,217.4 945.3 8,893.2
Total realized/unrealized gains (losses) included in net income, assets 23.1 71.0 138.8 215.6
Net purchases, sales, issuances and settlements, assets (0.3) (21.1) (2.7) (7,841.5)
Ending balance, assets 1,081.4 1,267.3 1,081.4 1,267.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 13.1 71.5 126.0 215.6
Gross purchases, sales, issuances and settlements        
Purchases, assets       36.7
Sales, assets   (2.0)   (7,795.2)
Issuances, assets (0.1) (34.4) (2.0) (175.4)
Settlements, assets (0.2) 15.3 (0.7) 92.4
Net purchases, sales, issuances and settlements, assets $ (0.3) $ (21.1) $ (2.7) $ (7,841.5)