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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Assets: |  |  |
Total fixed maturities, available for sale | $ 23,724.7 | $ 21,506.2 |
Equity securities - corporate securities | 120.5 | 96.9 |
Total trading securities | 217.4 | 222.7 |
Investments held by variable interest entities - corporate securities | 250.1 | 768.6 |
Total other invested assets | 1,595.5 | 1,353.4 |
Market risk benefit asset | 96.4 | 75.4 | $ 89.3
Assets held in separate accounts | 3.3 | 3.1 |
Liabilities: |  |  |
Market risk benefit liability | 1.0 | 7.4 | $ 3.1
Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,728.7 | 11,837.5 |
Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 483.1 |  |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 199.3 | 194.4 |
States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,967.7 | 2,566.7 |
Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 94.7 | 83.1 |
Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,535.0 | 1,372.4 |
Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 826.9 | 648.0 |
Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,608.7 | 1,553.2 |
Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,082.2 | 1,032.8 |
Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,198.4 | 2,218.1 |
Significant unobservable inputs (Level 3) |  |  |
Assets: |  |  |
Total assets carried at fair value by category | 401.9 | 377.5 |
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Total trading securities | 217.4 | 222.7 |
Investments held by variable interest entities - corporate securities | 250.1 | 768.6 |
Derivatives | 373.6 | 239.2 |
Residual tranches | 76.9 | 39.0 |
Total other invested assets | 450.5 | 278.2 |
Market risk benefit asset | 96.4 | 75.4 |
Assets held in separate accounts | 3.3 | 3.1 |
Total assets carried at fair value by category | 24,862.9 | 22,951.1 |
Liabilities: |  |  |
Market risk benefit liability | 1.0 | 7.4 |
Embedded derivatives associated with fixed indexed annuity products | 1,551.9 | 1,376.7 |
Total liabilities carried at fair value by category | 1,552.9 | 1,384.1 |
Fair Value, Measurements, Recurring | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 12,728.7 | 11,837.5 |
Equity securities - corporate securities | 120.5 | 96.9 |
Fair Value, Measurements, Recurring | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 483.1 |  |
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 199.3 | 194.4 |
Fair Value, Measurements, Recurring | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,967.7 | 2,566.7 |
Fair Value, Measurements, Recurring | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 94.7 | 83.1 |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,535.0 | 1,372.4 |
Total trading securities | 41.9 | 32.8 |
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 826.9 | 648.0 |
Total trading securities | 4.4 | 3.5 |
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,608.7 | 1,553.2 |
Total trading securities | 56.5 | 58.5 |
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,082.2 | 1,032.8 |
Total trading securities | 9.4 | 9.0 |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,198.4 | 2,218.1 |
Total trading securities | 105.2 | 118.9 |
Fair Value, Measurements, Recurring | Total Fixed Maturities, Available For Sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 23,724.7 | 21,506.2 |
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 |
Market risk benefit asset | 0.0 | 0.0 |
Assets held in separate accounts | 0.0 | 0.0 |
Total assets carried at fair value by category | 47.1 | 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: |  |  |
Total fixed maturities, available for sale | 0.0 | 0.0 |
Equity securities - corporate securities | 47.1 | 24.2 |
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 |  |
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 | 217.4 | 222.7 |
Investments held by variable interest entities - corporate securities | 250.1 | 768.6 |
Derivatives | 373.6 | 239.2 |
Residual tranches | 0.9 | 7.5 |
Total other invested assets | 374.5 | 246.7 |
Market risk benefit asset | 0.0 | 0.0 |
Assets held in separate accounts | 3.3 | 3.1 |
Total assets carried at fair value by category | 24,413.9 | 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: |  |  |
Total fixed maturities, available for sale | 12,599.0 | 11,678.2 |
Equity securities - corporate securities | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 483.1 |  |
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 | 199.3 | 194.4 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,967.7 | 2,566.7 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 94.7 | 83.1 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,508.6 | 1,346.9 |
Total trading securities | 41.9 | 32.8 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 826.9 | 648.0 |
Total trading securities | 4.4 | 3.5 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,608.7 | 1,553.2 |
Total trading securities | 56.5 | 58.5 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 1,082.2 | 1,032.8 |
Total trading securities | 9.4 | 9.0 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 2,198.4 | 2,205.0 |
Total trading securities | 105.2 | 118.9 |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total Fixed Maturities, Available For Sale |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 23,568.6 | 21,308.3 |
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 | 76.0 | 31.5 |
Total other invested assets | 76.0 | 31.5 |
Market risk benefit asset | 96.4 | 75.4 |
Assets held in separate accounts | 0.0 | 0.0 |
Total assets carried at fair value by category | 401.9 | 377.5 |
Liabilities: |  |  |
Market risk benefit liability | 1.0 | 7.4 |
Embedded derivatives associated with fixed indexed annuity products | 1,551.9 | 1,376.7 |
Total liabilities carried at fair value by category | 1,552.9 | 1,384.1 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate securities |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 129.7 | 159.3 |
Equity securities - corporate securities | 73.4 | 72.7 |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Certificates of deposit |  |  |
Assets: |  |  |
Total fixed maturities, available for sale | 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 | 26.4 | 25.5 |
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 | 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 | 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 | 0.0 | 13.1 |
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 | $ 156.1 | $ 197.9 |

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