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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Assets:      
Total fixed maturities, available for sale $ 23,405.3 $ 22,730.1  
Equity securities - corporate securities 377.2 272.4  
Total trading securities 296.9 304.2  
Investments held by variable interest entities - corporate securities 296.8 433.8  
Total other invested assets 1,617.0 1,491.5  
Assets held in separate accounts 2.7 3.3  
Liabilities:      
Market risk benefit liability 52.6 60.0 $ 74.1
Corporate securities      
Assets:      
Total fixed maturities, available for sale 13,004.8 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 179.4 186.2  
States and political subdivisions      
Assets:      
Total fixed maturities, available for sale 2,995.7 2,834.3  
Foreign governments      
Assets:      
Total fixed maturities, available for sale 111.7 91.1  
Asset-backed securities      
Assets:      
Total fixed maturities, available for sale 1,515.7 1,516.4  
Agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 907.4 819.6  
Non-agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 1,511.4 1,539.1  
Collateralized loan obligations      
Assets:      
Total fixed maturities, available for sale 1,126.1 1,016.8  
Commercial mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 2,053.1 2,197.5  
Significant unobservable inputs  (Level 3)      
Assets:      
Total assets carried at fair value 76.5 76.4  
Liabilities:      
Total liabilities carried at fair value 1,651.0 1,531.6  
Fair Value, Measurements, Recurring      
Assets:      
Total trading securities 296.9 304.2  
Investments held by variable interest entities - corporate securities 296.8 433.8  
Derivatives 297.2 279.0  
Residual tranches 2.6 96.9  
Total other invested assets 299.8 375.9  
Assets held in separate accounts 2.7 3.3  
Total assets carried at fair value 24,657.3 24,119.6  
Equity securities measured at net asset value 21.4    
Total assets carried at fair value 24,678.7    
Liabilities:      
Market risk benefit liability 52.6 60.0  
Embedded derivatives associated with fixed indexed annuity products 1,598.4 1,471.6  
Total liabilities carried at fair value 1,651.0 1,531.6  
Fair Value, Measurements, Recurring | Corporate securities      
Assets:      
Total fixed maturities, available for sale 13,004.8 12,040.8  
Equity securities - corporate securities 355.8 272.3  
Total trading securities 0.0    
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 179.4 186.2  
Fair Value, Measurements, Recurring | States and political subdivisions      
Assets:      
Total fixed maturities, available for sale 2,995.7 2,834.3  
Fair Value, Measurements, Recurring | Foreign governments      
Assets:      
Total fixed maturities, available for sale 111.7 91.1  
Fair Value, Measurements, Recurring | Asset-backed securities      
Assets:      
Total fixed maturities, available for sale 1,515.7 1,516.4  
Total trading securities 39.4 40.6  
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 907.4 819.6  
Total trading securities 98.0 97.1  
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 1,511.4 1,539.1  
Total trading securities 45.9 53.3  
Fair Value, Measurements, Recurring | Collateralized loan obligations      
Assets:      
Total fixed maturities, available for sale 1,126.1 1,016.8  
Total trading securities 9.6 9.5  
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 2,053.1 2,197.5  
Total trading securities 104.0 103.7  
Fair Value, Measurements, Recurring | Total Fixed Maturities, Available For Sale      
Assets:      
Total fixed maturities, available for sale 23,405.3 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 150.6 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 150.6 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 296.9 304.2  
Investments held by variable interest entities - corporate securities 296.8 433.8  
Derivatives 297.2 279.0  
Residual tranches 0.0 1.5  
Total other invested assets 297.2 280.5  
Assets held in separate accounts 2.7 3.3  
Total assets carried at fair value 23,844.4 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 12,522.6 11,912.8  
Equity securities - corporate securities 131.0 134.9  
Total trading securities 0.0    
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 179.4 186.2  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions      
Assets:      
Total fixed maturities, available for sale 2,995.7 2,834.3  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments      
Assets:      
Total fixed maturities, available for sale 111.7 91.1  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities      
Assets:      
Total fixed maturities, available for sale 1,421.1 1,496.6  
Total trading securities 39.4 40.6  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 907.4 819.6  
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 1,511.4 1,539.1  
Total trading securities 45.9 53.3  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations      
Assets:      
Total fixed maturities, available for sale 1,126.1 1,012.8  
Total trading securities 9.6 9.5  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 2,044.4 2,193.4  
Total trading securities 104.0 103.7  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total Fixed Maturities, Available For Sale      
Assets:      
Total fixed maturities, available for sale 22,819.8 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 662.3 324.7  
Total assets carried at fair value    
Liabilities:      
Market risk benefit liability 52.6 60.0  
Embedded derivatives associated with fixed indexed annuity products 1,598.4 1,471.6  
Total liabilities carried at fair value 1,651.0 1,531.6  
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Corporate securities      
Assets:      
Total fixed maturities, available for sale 482.2 128.0  
Equity securities - corporate securities 74.2 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 94.6 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 8.7 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 $ 585.5 $ 155.9