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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Assets:        
Fixed maturities, available for sale $ 22,167.9 $ 21,293.1 $ 21,295.2 $ 18,443.7
Equity securities - corporate securities 60.5   44.1  
Total trading securities 240.6   243.9  
Investments held by variable interest entities - corporate securities 1,137.4 $ 1,178.7 1,188.6  
Assets held in separate accounts 3.7   4.2  
Corporate securities        
Assets:        
Fixed maturities, available for sale 13,627.6   12,935.3  
United States Treasury securities and obligations of United States government corporations and agencies        
Assets:        
Fixed maturities, available for sale 230.3   204.6  
States and political subdivisions        
Assets:        
Fixed maturities, available for sale 2,483.4   2,246.7  
Foreign governments        
Assets:        
Fixed maturities, available for sale 101.5   95.6  
Asset-backed securities        
Assets:        
Fixed maturities, available for sale 1,175.4   1,387.9  
Agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 75.4   95.0  
Non-agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 2,138.2   2,042.3  
Collateralized loan obligations        
Assets:        
Fixed maturities, available for sale 442.5   400.8  
Commercial mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 1,893.6   1,887.0  
Significant unobservable inputs (Level 3)        
Assets:        
Total assets carried at fair value by category 147.5   213.3  
Fair Value, Measurements, Recurring        
Assets:        
Fixed maturities, available for sale 22,167.9   21,295.2  
Total trading securities 240.6   243.9  
Investments held by variable interest entities - corporate securities 1,137.4   1,188.6  
Other invested assets - derivatives 99.3   203.8  
Assets held in separate accounts 3.7   4.2  
Total assets carried at fair value by category 23,709.4   22,979.8  
Liabilities:        
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities) 1,526.9   1,565.4  
Fair Value, Measurements, Recurring | Corporate securities        
Assets:        
Fixed maturities, available for sale 13,627.6   12,935.3  
Equity securities - corporate securities 60.5   44.1  
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies        
Assets:        
Fixed maturities, available for sale 230.3   204.6  
Fair Value, Measurements, Recurring | States and political subdivisions        
Assets:        
Fixed maturities, available for sale 2,483.4   2,246.7  
Fair Value, Measurements, Recurring | Foreign governments        
Assets:        
Fixed maturities, available for sale 101.5   95.6  
Total trading securities 2.0      
Fair Value, Measurements, Recurring | Asset-backed securities        
Assets:        
Fixed maturities, available for sale 1,175.4   1,387.9  
Total trading securities 10.2   12.1  
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 75.4   95.0  
Total trading securities 0.4   0.4  
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 2,138.2   2,042.3  
Total trading securities 100.9   113.4  
Fair Value, Measurements, Recurring | Collateralized loan obligations        
Assets:        
Fixed maturities, available for sale 442.5   400.8  
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 1,893.6   1,887.0  
Total trading securities 127.1   118.0  
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1)        
Assets:        
Fixed maturities, available for sale 0.0   0.0  
Total trading securities 0.0   0.0  
Investments held by variable interest entities - corporate securities 0.0   0.0  
Other invested assets - derivatives 0.0   0.0  
Assets held in separate accounts 0.0   0.0  
Total assets carried at fair value by category 15.9   31.3  
Liabilities:        
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities) 0.0   0.0  
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Corporate securities        
Assets:        
Fixed maturities, available for sale 0.0   0.0  
Equity securities - corporate securities 15.9   31.3  
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:        
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:        
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:        
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) | Asset-backed securities        
Assets:        
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:        
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:        
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:        
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) | Commercial mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 0.0   0.0  
Total trading securities 0.0   0.0  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)        
Assets:        
Fixed maturities, available for sale 22,041.1   21,102.7  
Total trading securities 228.6   231.4  
Investments held by variable interest entities - corporate securities 1,137.0   1,188.6  
Other invested assets - derivatives 99.3   203.8  
Assets held in separate accounts 3.7   4.2  
Total assets carried at fair value by category 23,546.0   22,735.2  
Liabilities:        
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities) 0.0   0.0  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Corporate securities        
Assets:        
Fixed maturities, available for sale 13,513.4   12,756.5  
Equity securities - corporate securities 36.3   4.5  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | United States Treasury securities and obligations of United States government corporations and agencies        
Assets:        
Fixed maturities, available for sale 230.3   204.6  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions        
Assets:        
Fixed maturities, available for sale 2,483.4   2,246.7  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments        
Assets:        
Fixed maturities, available for sale 101.5   94.5  
Total trading securities 2.0      
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities        
Assets:        
Fixed maturities, available for sale 1,162.8   1,375.3  
Total trading securities 10.2   12.1  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 75.4   95.0  
Total trading securities 0.4   0.4  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 2,138.2   2,042.3  
Total trading securities 100.9   113.4  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations        
Assets:        
Fixed maturities, available for sale 442.5   400.8  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 1,893.6   1,887.0  
Total trading securities 115.1   105.5  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)        
Assets:        
Fixed maturities, available for sale 126.8   192.5  
Total trading securities 12.0   12.5  
Investments held by variable interest entities - corporate securities 0.4   0.0  
Other invested assets - derivatives 0.0   0.0  
Assets held in separate accounts 0.0   0.0  
Total assets carried at fair value by category 147.5   213.3  
Liabilities:        
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities) 1,526.9   1,565.4  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate securities        
Assets:        
Fixed maturities, available for sale 114.2   178.8  
Equity securities - corporate securities 8.3   8.3  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | United States Treasury securities and obligations of United States government corporations and agencies        
Assets:        
Fixed maturities, available for sale 0.0   0.0  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | States and political subdivisions        
Assets:        
Fixed maturities, available for sale 0.0   0.0  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Foreign governments        
Assets:        
Fixed maturities, available for sale 0.0   1.1  
Total trading securities 0.0      
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Asset-backed securities        
Assets:        
Fixed maturities, available for sale 12.6   12.6  
Total trading securities 0.0   0.0  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Agency residential mortgage-backed securities        
Assets:        
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:        
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:        
Fixed maturities, available for sale 0.0   0.0  
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 0.0   0.0  
Total trading securities $ 12.0   $ 12.5