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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
Mar. 31, 2024
Mar. 31, 2023
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
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
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
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
Beginning balance, net derivative assets (liabilities) $ 5.5 $ (3.4)
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) $ (5.0) $ 7.4
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
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
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) $ 0.4  
Ending balance, net derivative assets (liabilities) 0.9 $ 4.0
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (4.5) 7.3
Gross purchases, sales, issuances and settlements    
Purchases, net derivative assets (liabilities) 0.2  
Sales, net derivative assets (liabilities) 0.2  
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 0.4  
Investment and universal life contracts    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, liabilities (115.5) (46.4)
Total realized/unrealized gains (losses) included in net income, liabilities (43.4) (5.3)
Net purchases, sales, issuances and settlements, liabilities (15.8) (3.8)
Ending balance, liabilities (174.7) (55.5)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (44.5) (7.1)
Gross purchases, sales, issuances and settlements    
Issuances, liabilities (33.8) (8.2)
Settlements, liabilities 18.0 4.4
Net purchases, sales, issuances and settlements, liabilities (15.8) (3.8)
Funds withheld payable embedded derivative    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, liabilities 2,567.1 3,652.8
Total realized/unrealized gains (losses) included in net income, liabilities 197.0 (626.6)
Ending balance, liabilities 2,764.1 3,026.2
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 197.0 (626.6)
Fixed maturities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 3,636.8 2,166.6
Total realized/unrealized gains (losses) included in net income, assets (5.2)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (21.5) (10.3)
Net purchases, sales, issuances and settlements, assets (78.5) 431.7
Transfers into Level 3, assets 119.5 228.7
Transfers out of Level 3, assets (111.6) (58.1)
Ending balance, assets 3,539.5 2,758.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.6)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (22.9) (10.3)
Gross purchases, sales, issuances and settlements    
Purchases, assets 266.5 463.1
Sales, assets (280.2) (3.6)
Settlements, assets (64.8) (27.8)
Net purchases, sales, issuances and settlements, assets (78.5) 431.7
States and political subdivisions | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 69.9 70.9
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.3) 1.6
Net purchases, sales, issuances and settlements, assets (0.4) (0.4)
Ending balance, assets 68.2 72.1
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (1.3) 1.6
Gross purchases, sales, issuances and settlements    
Settlements, assets (0.4) (0.4)
Net purchases, sales, issuances and settlements, assets (0.4) (0.4)
Corporate debt securities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 2,305.9 1,568.3
Total realized/unrealized gains (losses) included in net income, assets (5.2)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (11.2) (6.6)
Net purchases, sales, issuances and settlements, assets (126.4) 125.3
Transfers into Level 3, assets 39.5 10.4
Transfers out of Level 3, assets   (42.9)
Ending balance, assets 2,202.6 1,654.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.6)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (12.6) (6.6)
Gross purchases, sales, issuances and settlements    
Purchases, assets 135.5 150.9
Sales, assets (221.1) (3.6)
Settlements, assets (40.8) (22.0)
Net purchases, sales, issuances and settlements, assets (126.4) 125.3
Commercial mortgage-backed securities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 3.0 3.4
Total realized/unrealized gains (losses) included in other comprehensive income, assets   0.1
Net purchases, sales, issuances and settlements, assets (0.1) (0.2)
Ending balance, assets 2.9 3.3
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets   0.1
Gross purchases, sales, issuances and settlements    
Settlements, assets (0.1) (0.2)
Net purchases, sales, issuances and settlements, assets (0.1) (0.2)
Collateralized debt obligations | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 75.4 56.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.7) 1.1
Net purchases, sales, issuances and settlements, assets 25.7 120.1
Transfers out of Level 3, assets   (15.2)
Ending balance, assets 99.4 162.2
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (1.7) 1.1
Gross purchases, sales, issuances and settlements    
Purchases, assets 25.7 121.3
Settlements, assets   (1.2)
Net purchases, sales, issuances and settlements, assets 25.7 120.1
Other debt obligations | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 1,182.6 467.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets (7.3) (6.5)
Net purchases, sales, issuances and settlements, assets 22.7 186.9
Transfers into Level 3, assets 80.0 218.3
Transfers out of Level 3, assets (111.6)  
Ending balance, assets 1,166.4 866.5
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (7.3) (6.5)
Gross purchases, sales, issuances and settlements    
Purchases, assets 105.3 190.9
Sales, assets (59.1)  
Settlements, assets (23.5) (4.0)
Net purchases, sales, issuances and settlements, assets 22.7 186.9
Other investments    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 165.1 1.9
Total realized/unrealized gains (losses) included in net income, assets (5.3)  
Net purchases, sales, issuances and settlements, assets 6.0  
Ending balance, assets 165.8 1.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.4)  
Gross purchases, sales, issuances and settlements    
Purchases, assets 51.9  
Settlements, assets (45.9)  
Net purchases, sales, issuances and settlements, assets 6.0  
Fixed maturities, trading.    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 415.8 134.0
Total realized/unrealized gains (losses) included in net income, assets (3.5) (0.4)
Net purchases, sales, issuances and settlements, assets 57.9 22.5
Ending balance, assets 470.2 156.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.7) (0.3)
Gross purchases, sales, issuances and settlements    
Purchases, assets 187.3 26.4
Sales, assets (97.0) (3.5)
Settlements, assets (32.4) (0.4)
Net purchases, sales, issuances and settlements, assets 57.9 22.5
Separate account assets    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 752.8 1,034.9
Total realized/unrealized gains (losses) included in net income, assets (26.3) 15.0
Net purchases, sales, issuances and settlements, assets (0.9) (156.1)
Ending balance, assets 725.6 893.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (33.3) (21.8)
Gross purchases, sales, issuances and settlements    
Sales, assets (30.3) (202.0)
Issuances, assets (9.6) (4.1)
Settlements, assets 39.0 50.0
Net purchases, sales, issuances and settlements, assets $ (0.9) $ (156.1)