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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025
--- | --- | --- | ---
Assets: |  |  |
Total fixed maturities, available for sale | $ 23,881.1 | $ 23,886.8 |
Equity securities - corporate securities | 332.8 | 389.2 |
Total trading securities | 280.2 | 294.8 |
Investments held by variable interest entities - corporate securities | 287.4 | 293.0 |
Total other invested assets | 1,695.1 | 1,737.0 |
Assets held in separate accounts | 2.7 | 2.8 |
Liabilities: |  |  |
Market risk benefit liability | 58.1 | 48.1 | $ 73.6
Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,981.8 | 13,262.5 |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 176.4 | 177.1 |
States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,879.2 | 2,954.7 |
Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 120.8 | 120.5 |
Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,800.4 | 1,747.3 |
Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 819.2 | 849.5 |
Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,503.4 | 1,585.7 |
Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,463.6 | 1,142.5 |
Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,136.3 | 2,047.0 |
Significant unobservable inputs (Level 3) |  |  |
Assets: |  |  |
Total assets carried at fair value by category | 75.8 | 76.1 |
Liabilities: |  |  |
Total liabilities carried at fair value | 1,622.3 | 1,648.7 |
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Total trading securities | 280.2 | 294.8 |
Investments held by variable interest entities - corporate securities | 287.4 | 293.0 |
Derivatives | 195.2 | 323.5 |
Residual tranches | 4.5 | 4.2 |
Total other invested assets | 199.7 | 327.7 |
Assets held in separate accounts | 2.7 | 2.8 |
Total assets carried at fair value by category | 24,954.8 | 25,172.3 |
Equity securities measured at net asset value | 29.1 | 22.0 |
Total assets carried at fair value | 24,983.9 | 25,194.3 |
Liabilities: |  |  |
Market risk benefit liability | 58.1 | 48.1 |
Embedded derivatives associated with fixed indexed annuity products | 1,564.2 | 1,600.6 |
Total liabilities carried at fair value | 1,622.3 | 1,648.7 |
Fair Value, Measurements, Recurring | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,981.8 | 13,262.5 |
Equity securities - corporate securities | 303.7 | 367.2 |
Total trading securities | 3.0 |  |
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 176.4 | 177.1 |
Fair Value, Measurements, Recurring | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,879.2 | 2,954.7 |
Fair Value, Measurements, Recurring | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 120.8 | 120.5 |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,800.4 | 1,747.3 |
Total trading securities | 37.4 | 38.7 |
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 819.2 | 849.5 |
Total trading securities | 87.4 | 97.5 |
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,503.4 | 1,585.7 |
Total trading securities | 38.5 | 44.2 |
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,463.6 | 1,142.5 |
Total trading securities | 9.6 | 9.7 |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,136.3 | 2,047.0 |
Total trading securities | 104.3 | 104.7 |
Fair Value, Measurements, Recurring | Total fixed maturities, available for sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 23,881.1 | 23,886.8 |
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 | 174.4 | 176.5 |
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 | 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 | 174.4 | 176.5 |
Total trading securities | 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 | 280.2 | 294.8 |
Investments held by variable interest entities - corporate securities | 287.4 | 293.0 |
Derivatives | 195.2 | 323.5 |
Residual tranches | 0.0 | 0.0 |
Total other invested assets | 195.2 | 323.5 |
Assets held in separate accounts | 2.7 | 2.8 |
Total assets carried at fair value by category | 24,478.0 | 24,746.1 |
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 | 12,821.9 | 13,130.7 |
Equity securities - corporate securities | 55.4 | 117.0 |
Total trading securities | 3.0 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 176.4 | 177.1 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,879.2 | 2,954.7 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 120.8 | 120.5 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,757.2 | 1,710.8 |
Total trading securities | 37.4 | 38.7 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 819.2 | 849.5 |
Total trading securities | 87.4 | 97.5 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,486.0 | 1,585.7 |
Total trading securities | 38.5 | 44.2 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,463.6 | 1,142.5 |
Total trading securities | 9.6 | 9.7 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,132.8 | 2,043.5 |
Total trading securities | 104.3 | 104.7 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total fixed maturities, available for sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 23,657.1 | 23,715.0 |
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 | 4.5 | 4.2 |
Total other invested assets | 4.5 | 4.2 |
Assets held in separate accounts | 0.0 | 0.0 |
Total assets carried at fair value by category | 302.4 | 249.7 |
Liabilities: |  |  |
Market risk benefit liability | 58.1 | 48.1 |
Embedded derivatives associated with fixed indexed annuity products | 1,564.2 | 1,600.6 |
Total liabilities carried at fair value | 1,622.3 | 1,648.7 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 159.9 | 131.8 |
Equity securities - corporate securities | 73.9 | 73.7 |
Total trading securities | 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 | 43.2 | 36.5 |
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 | 17.4 | 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 | 0.0 |
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 | 3.5 | 3.5 |
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 | $ 224.0 | $ 171.8 |

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