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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