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FAIR VALUE MEASUREMENTS - FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS MEASURED ON A RECURRING BASIS - SECURITIES (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Estimated fair value | $ 22,840.5 | $ 21,506.2
Equity securities - corporate securities | 162.0 | 96.9
Trading securities | 304.2 | 222.7
Investments held by variable interest entities | 432.3 | 768.6
Total other invested assets | 1,491.5 | 1,353.4
Assets held in separate accounts | 3.3 | 3.1
Liabilities: |  |
Market risk benefit liability | 60.0 | 117.1
Significant unobservable inputs (Level 3) |  |
Assets: |  |
Total assets carried at fair value by category | 324.7 | 302.1
Fair value, Measurements, Recurring |  |
Assets: |  |
Trading securities | 304.2 | 222.7
Investments held by variable interest entities | 432.3 | 768.6
Derivatives | 279.0 | 239.2
Residual tranches | 96.9 | 39.0
Total other invested assets | 375.9 | 278.2
Assets held in separate accounts | 3.3 | 3.1
Total assets carried at fair value by category | 24,118.2 | 22,875.7
Liabilities: |  |
Market risk benefit liability | 60.0 | 117.1
Embedded derivatives associated with fixed indexed annuity products | 1,493.2 | 1,376.7
Total liabilities carried at fair value by category | 1,553.2 | 1,493.8
Fair value, Measurements, Recurring | Corporate securities |  |
Assets: |  |
Estimated fair value | 12,151.1 | 11,837.5
Equity securities - corporate securities | 162.0 | 96.9
Fair value, Measurements, Recurring | Certificates of deposit |  |
Assets: |  |
Estimated fair value | 488.3 | 0.0
Fair value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies |  |
Assets: |  |
Estimated fair value | 186.2 | 194.4
Fair value, Measurements, Recurring | States and political subdivisions |  |
Assets: |  |
Estimated fair value | 2,834.3 | 2,566.7
Fair value, Measurements, Recurring | Foreign governments |  |
Assets: |  |
Estimated fair value | 91.2 | 83.1
Fair value, Measurements, Recurring | Asset-backed securities |  |
Assets: |  |
Estimated fair value | 1,516.4 | 1,372.4
Trading securities | 40.6 | 32.8
Fair value, Measurements, Recurring | Agency residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 819.6 | 648.0
Trading securities | 97.1 | 3.5
Fair value, Measurements, Recurring | Non-agency residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 1,539.1 | 1,553.2
Trading securities | 53.3 | 58.5
Fair value, Measurements, Recurring | Collateralized loan obligations |  |
Assets: |  |
Estimated fair value | 1,016.8 | 1,032.8
Trading securities | 9.5 | 9.0
Fair value, Measurements, Recurring | Commercial mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 2,197.5 | 2,218.1
Trading securities | 103.7 | 118.9
Fair value, Measurements, Recurring | Total fixed maturities, available for sale |  |
Assets: |  |
Estimated fair value | 22,840.5 | 21,506.2
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) |  |
Assets: |  |
Trading securities | 0.0 | 0.0
Investments held by variable interest entities | 0.0 | 0.0
Derivatives | 0.0 | 0.0
Residual tranches | 0.0 | 0.0
Total other invested assets | 0.0 | 0.0
Assets held in separate accounts | 0.0 | 0.0
Total assets carried at fair value by category | 64.0 | 24.2
Liabilities: |  |
Market risk benefit liability | 0.0 | 0.0
Embedded derivatives associated with fixed indexed annuity products | 0.0 | 0.0
Total liabilities carried at fair value by category | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Corporate securities |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Equity securities - corporate securities | 64.0 | 24.2
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Certificates of deposit |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | United States Treasury securities and obligations of United States government corporations and agencies |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | States and political subdivisions |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Foreign governments |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Asset-backed securities |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Agency residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Non-agency residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Collateralized loan obligations |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Commercial mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Total fixed maturities, available for sale |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |
Assets: |  |
Trading securities | 304.2 | 222.7
Investments held by variable interest entities | 432.3 | 768.6
Derivatives | 279.0 | 239.2
Residual tranches | 1.5 | 7.5
Total other invested assets | 280.5 | 246.7
Assets held in separate accounts | 3.3 | 3.1
Total assets carried at fair value by category | 23,729.5 | 22,549.4
Liabilities: |  |
Market risk benefit liability | 0.0 | 0.0
Embedded derivatives associated with fixed indexed annuity products | 0.0 | 0.0
Total liabilities carried at fair value by category | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Corporate securities |  |
Assets: |  |
Estimated fair value | 12,023.1 | 11,678.2
Equity securities - corporate securities | 24.6 | 0.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit |  |
Assets: |  |
Estimated fair value | 488.3 | 0.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | United States Treasury securities and obligations of United States government corporations and agencies |  |
Assets: |  |
Estimated fair value | 186.2 | 194.4
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions |  |
Assets: |  |
Estimated fair value | 2,834.3 | 2,566.7
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments |  |
Assets: |  |
Estimated fair value | 91.2 | 83.1
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities |  |
Assets: |  |
Estimated fair value | 1,496.6 | 1,346.9
Trading securities | 40.6 | 32.8
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 819.6 | 648.0
Trading securities | 97.1 | 3.5
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 1,539.1 | 1,553.2
Trading securities | 53.3 | 58.5
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations |  |
Assets: |  |
Estimated fair value | 1,012.8 | 1,032.8
Trading securities | 9.5 | 9.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 2,193.4 | 2,205.0
Trading securities | 103.7 | 118.9
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total fixed maturities, available for sale |  |
Assets: |  |
Estimated fair value | 22,684.6 | 21,308.3
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |
Assets: |  |
Trading securities | 0.0 | 0.0
Investments held by variable interest entities | 0.0 | 0.0
Derivatives | 0.0 | 0.0
Residual tranches | 95.4 | 31.5
Total other invested assets | 95.4 | 31.5
Assets held in separate accounts | 0.0 | 0.0
Total assets carried at fair value by category | 324.7 | 302.1
Liabilities: |  |
Market risk benefit liability | 60.0 | 117.1
Embedded derivatives associated with fixed indexed annuity products | 1,493.2 | 1,376.7
Total liabilities carried at fair value by category | 1,553.2 | 1,493.8
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate securities |  |
Assets: |  |
Estimated fair value | 128.0 | 159.3
Equity securities - corporate securities | 73.4 | 72.7
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Certificates of deposit |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | United States Treasury securities and obligations of United States government corporations and agencies |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | States and political subdivisions |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Foreign governments |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Asset-backed securities |  |
Assets: |  |
Estimated fair value | 19.8 | 25.5
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Agency residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Non-agency residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Collateralized loan obligations |  |
Assets: |  |
Estimated fair value | 4.0 | 0.0
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities |  |
Assets: |  |
Estimated fair value | 4.1 | 13.1
Trading securities | 0.0 | 0.0
Fair value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Total fixed maturities, available for sale |  |
Assets: |  |
Estimated fair value | $ 155.9 | $ 197.9

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