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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jan. 01, 2021
--- | --- | --- | --- | ---
Assets: |  |  |  |
Total fixed maturities, available for sale | $ 20,305.2 | $ 20,353.4 |  |
Equity securities - corporate securities | 95.5 | 135.3 |  |
Total trading securities | 221.2 | 207.9 |  |
Investments held by variable interest entities - corporate securities | 858.1 | 1,077.6 |  |
Total other invested assets | 1,119.9 | 1,034.7 |  |
Market risk benefit asset | 89.3 | 65.3 | $ 56.3 | $ 2.5
Assets held in separate accounts | 2.9 | 2.7 |  |
Liabilities: |  |  |  |
Market risk benefit liability | 3.1 | 11.3 | $ 13.7 | $ 114.8
Corporate securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 10,958.9 | 11,712.7 |  |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 165.4 | 158.7 |  |
States and political subdivisions |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 2,306.0 | 2,388.5 |  |
Foreign governments |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 76.0 | 74.7 |  |
Asset-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,359.2 | 1,287.0 |  |
Agency residential mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 615.9 | 175.0 |  |
Non-agency residential mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,525.2 | 1,548.5 |  |
Collateralized loan obligations |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,059.5 | 785.9 |  |
Commercial mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 2,239.1 | 2,222.4 |  |
Significant unobservable inputs (Level 3) |  |  |  |
Assets: |  |  |  |
Total assets carried at fair value by category | 358.2 | 418.7 |  |
Fair Value, Measurements, Recurring |  |  |  |
Assets: |  |  |  |
Total trading securities | 221.2 | 207.9 |  |
Investments held by variable interest entities - corporate securities | 858.1 | 1,077.6 |  |
Derivatives | 150.0 | 56.7 |  |
Residual tranches | 25.8 | 18.3 |  |
Total other invested assets | 175.8 | 75.0 |  |
Market risk benefit asset | 89.3 | 65.3 |  |
Assets held in separate accounts | 2.9 | 2.7 |  |
Total assets carried at fair value by category | 21,748.0 | 21,917.2 |  |
Liabilities: |  |  |  |
Market risk benefit liability | 3.1 | 11.3 |  |
Embedded derivatives associated with fixed indexed annuity products | 1,213.4 | 1,297.0 |  |
Total liabilities carried at fair value by category | 1,216.5 | 1,308.3 |  |
Fair Value, Measurements, Recurring | Corporate securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 10,958.9 | 11,712.7 |  |
Equity securities - corporate securities | 95.5 | 135.3 |  |
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 165.4 | 158.7 |  |
Fair Value, Measurements, Recurring | States and political subdivisions |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 2,306.0 | 2,388.5 |  |
Fair Value, Measurements, Recurring | Foreign governments |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 76.0 | 74.7 |  |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,359.2 | 1,287.0 |  |
Total trading securities | 34.9 | 15.1 |  |
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 615.9 | 175.0 |  |
Total trading securities | 3.4 | 0.3 |  |
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,525.2 | 1,548.5 |  |
Total trading securities | 59.9 | 60.7 |  |
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,059.5 | 785.9 |  |
Total trading securities | 8.9 |  |  |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 2,239.1 | 2,222.4 |  |
Total trading securities | 114.1 | 131.8 |  |
Fair Value, Measurements, Recurring | Total fixed maturities, available for sale |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 20,305.2 | 20,353.4 |  |
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 | 22.9 | 59.6 |  |
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 | 22.9 | 59.6 |  |
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 |  |  |
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 | 221.2 | 207.4 |  |
Investments held by variable interest entities - corporate securities | 858.1 | 1,077.6 |  |
Derivatives | 150.0 | 56.7 |  |
Residual tranches | 13.7 | 0.0 |  |
Total other invested assets | 163.7 | 56.7 |  |
Market risk benefit asset | 0.0 | 0.0 |  |
Assets held in separate accounts | 2.9 | 2.7 |  |
Total assets carried at fair value by category | 21,366.9 | 21,438.9 |  |
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 | 10,831.1 | 11,584.9 |  |
Equity securities - corporate securities | 0.0 | 0.0 |  |
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 | 165.4 | 158.7 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 2,306.0 | 2,388.5 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 76.0 | 74.7 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,317.7 | 1,230.0 |  |
Total trading securities | 34.9 | 15.1 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 615.9 | 175.0 |  |
Total trading securities | 3.4 | 0.3 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,522.6 | 1,492.3 |  |
Total trading securities | 59.9 | 60.2 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 1,059.5 | 782.5 |  |
Total trading securities | 8.9 |  |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 2,226.8 | 2,207.9 |  |
Total trading securities | 114.1 | 131.8 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total fixed maturities, available for sale |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 20,121.0 | 20,094.5 |  |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |
Assets: |  |  |  |
Total trading securities | 0.0 | 0.5 |  |
Investments held by variable interest entities - corporate securities | 0.0 | 0.0 |  |
Derivatives | 0.0 | 0.0 |  |
Residual tranches | 12.1 | 18.3 |  |
Total other invested assets | 12.1 | 18.3 |  |
Market risk benefit asset | 89.3 | 65.3 |  |
Assets held in separate accounts | 0.0 | 0.0 |  |
Total assets carried at fair value by category | 358.2 | 418.7 |  |
Liabilities: |  |  |  |
Market risk benefit liability | 3.1 | 11.3 |  |
Embedded derivatives associated with fixed indexed annuity products | 1,213.4 | 1,297.0 |  |
Total liabilities carried at fair value by category | 1,216.5 | 1,308.3 |  |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 127.8 | 127.8 |  |
Equity securities - corporate securities | 72.6 | 75.7 |  |
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 | 41.5 | 57.0 |  |
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 | 2.6 | 56.2 |  |
Total trading securities | 0.0 | 0.5 |  |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Collateralized loan obligations |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 0.0 | 3.4 |  |
Total trading securities | 0.0 |  |  |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities |  |  |  |
Assets: |  |  |  |
Total fixed maturities, available for sale | 12.3 | 14.5 |  |
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 | $ 184.2 | $ 258.9 |  |

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