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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Assets: |  |  |
Total fixed maturities, available for sale | $ 23,047.0 | $ 22,730.1 |
Equity securities - corporate securities | 387.4 | 272.4 |
Total trading securities | 308.3 | 304.2 |
Investments held by variable interest entities - corporate securities | 376.9 | 433.8 |
Total other invested assets | 1,500.5 | 1,491.5 |
Assets held in separate accounts | 2.9 | 3.3 |
Liabilities: |  |  |
Market risk benefit liability | 63.8 | 60.0 | $ 93.0
Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,577.4 | 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 | 188.2 | 186.2 |
States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,934.0 | 2,834.3 |
Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 99.5 | 91.1 |
Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,551.3 | 1,516.4 |
Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 919.1 | 819.6 |
Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,536.2 | 1,539.1 |
Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,090.5 | 1,016.8 |
Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,150.8 | 2,197.5 |
Significant unobservable inputs (Level 3) |  |  |
Assets: |  |  |
Total assets carried at fair value | 75.9 | 76.4 |
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Total trading securities | 308.3 | 304.2 |
Investments held by variable interest entities - corporate securities | 376.9 | 433.8 |
Derivatives | 210.4 | 279.0 |
Residual tranches | 2.6 | 96.9 |
Total other invested assets | 213.0 | 375.9 |
Assets held in separate accounts | 2.9 | 3.3 |
Total assets carried at fair value | 24,335.5 | 24,119.6 |
Residual tranches measured at net asset value | 104.9 |  |
Total assets carried at fair value | 24,440.4 |  |
Liabilities: |  |  |
Market risk benefit liability | 63.8 | 60.0 |
Embedded derivatives associated with fixed indexed annuity products | 1,502.4 | 1,471.6 |
Total liabilities carried at fair value | 1,566.2 | 1,531.6 |
Fair Value, Measurements, Recurring | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,577.4 | 12,040.8 |
Equity securities - corporate securities | 387.4 | 272.3 |
Total trading securities | 2.0 |  |
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 | 188.2 | 186.2 |
Fair Value, Measurements, Recurring | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,934.0 | 2,834.3 |
Fair Value, Measurements, Recurring | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 99.5 | 91.1 |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,551.3 | 1,516.4 |
Total trading securities | 39.9 | 40.6 |
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 919.1 | 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 | 1,536.2 | 1,539.1 |
Total trading securities | 51.3 | 53.3 |
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,090.5 | 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 | 2,150.8 | 2,197.5 |
Total trading securities | 107.7 | 103.7 |
Fair Value, Measurements, Recurring | Total Fixed Maturities, Available For Sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 23,047.0 | 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 | 161.8 | 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 | 161.8 | 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 | 308.3 | 304.2 |
Investments held by variable interest entities - corporate securities | 376.9 | 433.8 |
Derivatives | 210.4 | 279.0 |
Residual tranches | 0.0 | 1.5 |
Total other invested assets | 210.4 | 280.5 |
Assets held in separate accounts | 2.9 | 3.3 |
Total assets carried at fair value | 23,622.1 | 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 | 12,179.8 | 11,912.8 |
Equity securities - corporate securities | 131.2 | 134.9 |
Total trading securities | 2.0 |  |
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 | 188.2 | 186.2 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,934.0 | 2,834.3 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 99.5 | 91.1 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,497.8 | 1,496.6 |
Total trading securities | 39.9 | 40.6 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 919.1 | 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 | 1,536.2 | 1,539.1 |
Total trading securities | 51.3 | 53.3 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,090.5 | 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 | 2,147.3 | 2,193.4 |
Total trading securities | 107.7 | 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 | 22,592.4 | 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 | 551.6 | 324.7 |
Total assets carried at fair value |  |  |
Liabilities: |  |  |
Market risk benefit liability | 63.8 | 60.0 |
Embedded derivatives associated with fixed indexed annuity products | 1,502.4 | 1,471.6 |
Total liabilities carried at fair value | 1,566.2 | 1,531.6 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 397.6 | 128.0 |
Equity securities - corporate securities | 94.4 | 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 | 53.5 | 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 | 3.5 | 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 | $ 454.6 | $ 155.9 |

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