XML 66 R51.htm IDEA: XBRL DOCUMENT v3.26.1
FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Assets:      
Total fixed maturities, available for sale $ 23,881.1 $ 23,886.8  
Equity securities - corporate securities 332.8 389.2  
Total trading securities 280.2 294.8  
Investments held by variable interest entities - corporate securities 287.4 293.0  
Total other invested assets 1,695.1 1,737.0  
Assets held in separate accounts 2.7 2.8  
Liabilities:      
Market risk benefit liability 58.1 48.1 $ 73.6
Corporate securities      
Assets:      
Total fixed maturities, available for sale 12,981.8 13,262.5  
United States Treasury securities and obligations of United States government corporations and agencies      
Assets:      
Total fixed maturities, available for sale 176.4 177.1  
States and political subdivisions      
Assets:      
Total fixed maturities, available for sale 2,879.2 2,954.7  
Foreign governments      
Assets:      
Total fixed maturities, available for sale 120.8 120.5  
Asset-backed securities      
Assets:      
Total fixed maturities, available for sale 1,800.4 1,747.3  
Agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 819.2 849.5  
Non-agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 1,503.4 1,585.7  
Collateralized loan obligations      
Assets:      
Total fixed maturities, available for sale 1,463.6 1,142.5  
Commercial mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 2,136.3 2,047.0  
Significant unobservable inputs  (Level 3)      
Assets:      
Total assets carried at fair value by category 75.8 76.1  
Liabilities:      
Total liabilities carried at fair value 1,622.3 1,648.7  
Fair Value, Measurements, Recurring      
Assets:      
Total trading securities 280.2 294.8  
Investments held by variable interest entities - corporate securities 287.4 293.0  
Derivatives 195.2 323.5  
Residual tranches 4.5 4.2  
Total other invested assets 199.7 327.7  
Assets held in separate accounts 2.7 2.8  
Total assets carried at fair value by category 24,954.8 25,172.3  
Equity securities measured at net asset value 29.1 22.0  
Total assets carried at fair value 24,983.9 25,194.3  
Liabilities:      
Market risk benefit liability 58.1 48.1  
Embedded derivatives associated with fixed indexed annuity products 1,564.2 1,600.6  
Total liabilities carried at fair value 1,622.3 1,648.7  
Fair Value, Measurements, Recurring | Corporate securities      
Assets:      
Total fixed maturities, available for sale 12,981.8 13,262.5  
Equity securities - corporate securities 303.7 367.2  
Total trading securities 3.0    
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies      
Assets:      
Total fixed maturities, available for sale 176.4 177.1  
Fair Value, Measurements, Recurring | States and political subdivisions      
Assets:      
Total fixed maturities, available for sale 2,879.2 2,954.7  
Fair Value, Measurements, Recurring | Foreign governments      
Assets:      
Total fixed maturities, available for sale 120.8 120.5  
Fair Value, Measurements, Recurring | Asset-backed securities      
Assets:      
Total fixed maturities, available for sale 1,800.4 1,747.3  
Total trading securities 37.4 38.7  
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 819.2 849.5  
Total trading securities 87.4 97.5  
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 1,503.4 1,585.7  
Total trading securities 38.5 44.2  
Fair Value, Measurements, Recurring | Collateralized loan obligations      
Assets:      
Total fixed maturities, available for sale 1,463.6 1,142.5  
Total trading securities 9.6 9.7  
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 2,136.3 2,047.0  
Total trading securities 104.3 104.7  
Fair Value, Measurements, Recurring | Total fixed maturities, available for sale      
Assets:      
Total fixed maturities, available for sale 23,881.1 23,886.8  
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 174.4 176.5  
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 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 174.4 176.5  
Total trading securities 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 280.2 294.8  
Investments held by variable interest entities - corporate securities 287.4 293.0  
Derivatives 195.2 323.5  
Residual tranches 0.0 0.0  
Total other invested assets 195.2 323.5  
Assets held in separate accounts 2.7 2.8  
Total assets carried at fair value by category 24,478.0 24,746.1  
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 12,821.9 13,130.7  
Equity securities - corporate securities 55.4 117.0  
Total trading securities 3.0    
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 176.4 177.1  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions      
Assets:      
Total fixed maturities, available for sale 2,879.2 2,954.7  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments      
Assets:      
Total fixed maturities, available for sale 120.8 120.5  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities      
Assets:      
Total fixed maturities, available for sale 1,757.2 1,710.8  
Total trading securities 37.4 38.7  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 819.2 849.5  
Total trading securities 87.4 97.5  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 1,486.0 1,585.7  
Total trading securities 38.5 44.2  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations      
Assets:      
Total fixed maturities, available for sale 1,463.6 1,142.5  
Total trading securities 9.6 9.7  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities      
Assets:      
Total fixed maturities, available for sale 2,132.8 2,043.5  
Total trading securities 104.3 104.7  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total fixed maturities, available for sale      
Assets:      
Total fixed maturities, available for sale 23,657.1 23,715.0  
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 4.5 4.2  
Total other invested assets 4.5 4.2  
Assets held in separate accounts 0.0 0.0  
Total assets carried at fair value by category 302.4 249.7  
Liabilities:      
Market risk benefit liability 58.1 48.1  
Embedded derivatives associated with fixed indexed annuity products 1,564.2 1,600.6  
Total liabilities carried at fair value 1,622.3 1,648.7  
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Corporate securities      
Assets:      
Total fixed maturities, available for sale 159.9 131.8  
Equity securities - corporate securities 73.9 73.7  
Total trading securities 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 43.2 36.5  
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 17.4 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 3.5 3.5  
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 $ 224.0 $ 171.8