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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