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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Assets: |  |  |
Total fixed maturities, available for sale | $ 23,405.3 | $ 22,730.1 |
Equity securities - corporate securities | 377.2 | 272.4 |
Total trading securities | 296.9 | 304.2 |
Investments held by variable interest entities - corporate securities | 296.8 | 433.8 |
Total other invested assets | 1,617.0 | 1,491.5 |
Assets held in separate accounts | 2.7 | 3.3 |
Liabilities: |  |  |
Market risk benefit liability | 52.6 | 60.0 | $ 74.1
Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 13,004.8 | 12,040.8 |
Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 488.3 |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 179.4 | 186.2 |
States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,995.7 | 2,834.3 |
Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 111.7 | 91.1 |
Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,515.7 | 1,516.4 |
Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 907.4 | 819.6 |
Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,511.4 | 1,539.1 |
Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,126.1 | 1,016.8 |
Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,053.1 | 2,197.5 |
Significant unobservable inputs (Level 3) |  |  |
Assets: |  |  |
Total assets carried at fair value | 76.5 | 76.4 |
Liabilities: |  |  |
Total liabilities carried at fair value | 1,651.0 | 1,531.6 |
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Total trading securities | 296.9 | 304.2 |
Investments held by variable interest entities - corporate securities | 296.8 | 433.8 |
Derivatives | 297.2 | 279.0 |
Residual tranches | 2.6 | 96.9 |
Total other invested assets | 299.8 | 375.9 |
Assets held in separate accounts | 2.7 | 3.3 |
Total assets carried at fair value | 24,657.3 | 24,119.6 |
Equity securities measured at net asset value | 21.4 |  |
Total assets carried at fair value | 24,678.7 |  |
Liabilities: |  |  |
Market risk benefit liability | 52.6 | 60.0 |
Embedded derivatives associated with fixed indexed annuity products | 1,598.4 | 1,471.6 |
Total liabilities carried at fair value | 1,651.0 | 1,531.6 |
Fair Value, Measurements, Recurring | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 13,004.8 | 12,040.8 |
Equity securities - corporate securities | 355.8 | 272.3 |
Total trading securities | 0.0 |  |
Fair Value, Measurements, Recurring | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 488.3 |
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 179.4 | 186.2 |
Fair Value, Measurements, Recurring | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,995.7 | 2,834.3 |
Fair Value, Measurements, Recurring | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 111.7 | 91.1 |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,515.7 | 1,516.4 |
Total trading securities | 39.4 | 40.6 |
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 907.4 | 819.6 |
Total trading securities | 98.0 | 97.1 |
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,511.4 | 1,539.1 |
Total trading securities | 45.9 | 53.3 |
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,126.1 | 1,016.8 |
Total trading securities | 9.6 | 9.5 |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,053.1 | 2,197.5 |
Total trading securities | 104.0 | 103.7 |
Fair Value, Measurements, Recurring | Total Fixed Maturities, Available For Sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 23,405.3 | 22,730.1 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) |  |  |
Assets: |  |  |
Total trading securities | 0.0 | 0.0 |
Investments held by variable interest entities - corporate securities | 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 | 150.6 | 64.0 |
Total assets carried at fair value |  |  |
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 | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Equity securities - corporate securities | 150.6 | 64.0 |
Total trading securities | 0.0 |  |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 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: |  |  |
Total fixed maturities, available for sale | 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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Total 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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Total 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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Total 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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Total 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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Total 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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |
Assets: |  |  |
Total trading securities | 296.9 | 304.2 |
Investments held by variable interest entities - corporate securities | 296.8 | 433.8 |
Derivatives | 297.2 | 279.0 |
Residual tranches | 0.0 | 1.5 |
Total other invested assets | 297.2 | 280.5 |
Assets held in separate accounts | 2.7 | 3.3 |
Total assets carried at fair value | 23,844.4 | 23,730.9 |
Total assets carried at fair value |  |  |
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 | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,522.6 | 11,912.8 |
Equity securities - corporate securities | 131.0 | 134.9 |
Total trading securities | 0.0 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 488.3 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 179.4 | 186.2 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,995.7 | 2,834.3 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 111.7 | 91.1 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,421.1 | 1,496.6 |
Total trading securities | 39.4 | 40.6 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 907.4 | 819.6 |
Total trading securities | 98.0 | 97.1 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,511.4 | 1,539.1 |
Total trading securities | 45.9 | 53.3 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,126.1 | 1,012.8 |
Total trading securities | 9.6 | 9.5 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,044.4 | 2,193.4 |
Total trading securities | 104.0 | 103.7 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total Fixed Maturities, Available For Sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 22,819.8 | 22,574.2 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |
Assets: |  |  |
Total trading securities | 0.0 | 0.0 |
Investments held by variable interest entities - corporate securities | 0.0 | 0.0 |
Derivatives | 0.0 | 0.0 |
Residual tranches | 2.6 | 95.4 |
Total other invested assets | 2.6 | 95.4 |
Assets held in separate accounts | 0.0 | 0.0 |
Total assets carried at fair value | 662.3 | 324.7 |
Total assets carried at fair value |  |  |
Liabilities: |  |  |
Market risk benefit liability | 52.6 | 60.0 |
Embedded derivatives associated with fixed indexed annuity products | 1,598.4 | 1,471.6 |
Total liabilities carried at fair value | 1,651.0 | 1,531.6 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 482.2 | 128.0 |
Equity securities - corporate securities | 74.2 | 73.4 |
Total trading securities | 0.0 |  |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 94.6 | 19.8 |
Total trading securities | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Total trading securities | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Total trading securities | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 0.0 | 4.0 |
Total trading securities | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 8.7 | 4.1 |
Total trading securities | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Total Fixed Maturities, Available For Sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | $ 585.5 | $ 155.9 |

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