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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Assets: |  |  |
Total fixed maturities, available for sale | $ 23,283.0 | $ 22,840.5 |
Equity securities - corporate securities | 349.1 | 162.0 |
Total trading securities | 308.0 | 304.2 |
Investments held by variable interest entities - corporate securities | 380.2 | 432.3 |
Total other invested assets | 1,386.7 | 1,491.5 |
Assets held in separate accounts | 3.1 | 3.3 |
Liabilities: |  |  |
Market risk benefit liability | 73.6 | 60.0 | $ 99.6
Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,435.2 | 12,151.3 |
Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 470.7 | 488.3 |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 193.4 | 186.2 |
States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,934.2 | 2,834.3 |
Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 93.9 | 91.2 |
Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,576.5 | 1,516.3 |
Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 818.6 | 819.6 |
Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,590.2 | 1,539.0 |
Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,004.9 | 1,016.8 |
Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,165.4 | 2,197.5 |
Significant unobservable inputs (Level 3) |  |  |
Assets: |  |  |
Total assets carried at fair value by category | 76.4 | 76.4 |
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Total trading securities | 308.0 | 304.2 |
Investments held by variable interest entities - corporate securities | 380.2 | 432.3 |
Derivatives | 149.6 | 279.0 |
Residual tranches | 10.9 | 96.9 |
Total other invested assets | 160.5 | 375.9 |
Assets held in separate accounts | 3.1 | 3.3 |
Total assets carried at fair value by category | 24,483.9 | 24,118.2 |
Residual tranches measured at net asset value | 99.2 |  |
Total assets carried at fair value | 24,583.1 |  |
Liabilities: |  |  |
Market risk benefit liability | 73.6 | 60.0 |
Embedded derivatives associated with fixed indexed annuity products | 1,481.9 | 1,493.2 |
Total liabilities carried at fair value by category | 1,555.5 | 1,553.2 |
Fair Value, Measurements, Recurring | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,435.2 | 12,151.1 |
Equity securities - corporate securities | 349.1 | 162.0 |
Fair Value, Measurements, Recurring | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 470.7 | 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 | 193.4 | 186.2 |
Fair Value, Measurements, Recurring | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,934.3 | 2,834.3 |
Fair Value, Measurements, Recurring | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 93.9 | 91.2 |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,576.5 | 1,516.4 |
Total trading securities | 40.5 | 40.6 |
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 818.6 | 819.6 |
Total trading securities | 99.2 | 97.1 |
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,590.0 | 1,539.1 |
Total trading securities | 53.1 | 53.3 |
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,004.9 | 1,016.8 |
Total trading securities | 9.4 | 9.5 |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,165.5 | 2,197.5 |
Total trading securities | 105.8 | 103.7 |
Fair Value, Measurements, Recurring | Total Fixed Maturities, Available For Sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 23,283.0 | 22,840.5 |
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 by category | 119.6 | 64.0 |
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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Equity securities - corporate securities | 119.6 | 64.0 |
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 | 308.0 | 304.2 |
Investments held by variable interest entities - corporate securities | 380.2 | 432.3 |
Derivatives | 149.6 | 279.0 |
Residual tranches | 8.3 | 1.5 |
Total other invested assets | 157.9 | 280.5 |
Assets held in separate accounts | 3.1 | 3.3 |
Total assets carried at fair value by category | 24,011.1 | 23,729.5 |
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: |  |  |
Total fixed maturities, available for sale | 12,212.7 | 12,023.1 |
Equity securities - corporate securities | 156.2 | 24.6 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 470.7 | 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 | 193.4 | 186.2 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,934.3 | 2,834.3 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 93.9 | 91.2 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,525.9 | 1,496.6 |
Total trading securities | 40.5 | 40.6 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 818.6 | 819.6 |
Total trading securities | 99.2 | 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 | 1,590.0 | 1,539.1 |
Total trading securities | 53.1 | 53.3 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,004.9 | 1,012.8 |
Total trading securities | 9.4 | 9.5 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,161.3 | 2,193.4 |
Total trading securities | 105.8 | 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 | 23,005.7 | 22,684.6 |
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 by category | 353.2 | 324.7 |
Liabilities: |  |  |
Market risk benefit liability | 73.6 | 60.0 |
Embedded derivatives associated with fixed indexed annuity products | 1,481.9 | 1,493.2 |
Total liabilities carried at fair value by category | 1,555.5 | 1,553.2 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 222.5 | 128.0 |
Equity securities - corporate securities | 73.3 | 73.4 |
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 | 50.6 | 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 | 4.2 | 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 | $ 277.3 | $ 155.9 |

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