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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Assets:        
Fixed maturities, available for sale $ 22,702.9 $ 21,293.1 $ 21,295.2 $ 18,443.7
Equity securities - corporate securities 62.1   44.1  
Total trading securities 240.3   243.9  
Investments held by variable interest entities - corporate securities 1,172.6 $ 1,178.7 1,188.6  
Assets held in separate accounts 3.9   4.2  
Corporate securities        
Assets:        
Fixed maturities, available for sale 13,970.6   12,935.3  
United States Treasury securities and obligations of United States government corporations and agencies        
Assets:        
Fixed maturities, available for sale 241.8   204.6  
States and political subdivisions        
Assets:        
Fixed maturities, available for sale 2,628.7   2,246.7  
Foreign governments        
Assets:        
Fixed maturities, available for sale 104.3   95.6  
Asset-backed securities        
Assets:        
Fixed maturities, available for sale 1,117.4   1,387.9  
Agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 67.6   95.0  
Non-agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 2,161.0   2,042.3  
Commercial mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 1,951.4   1,887.0  
Collateralized loan obligations        
Assets:        
Fixed maturities, available for sale 460.1   400.8  
Significant unobservable inputs  (Level 3)        
Assets:        
Total assets carried at fair value by category 163.5   213.3  
Fair Value, Measurements, Recurring        
Assets:        
Fixed maturities, available for sale 22,702.9   21,295.2  
Total trading securities 240.3   243.9  
Investments held by variable interest entities - corporate securities 1,172.6   1,188.6  
Other invested assets - derivatives 143.8   203.8  
Assets held in separate accounts 3.9   4.2  
Total assets carried at fair value by category 24,325.6   22,979.8  
Liabilities:        
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities) 1,598.9   1,565.4  
Fair Value, Measurements, Recurring | Corporate securities        
Assets:        
Fixed maturities, available for sale 13,970.6   12,935.3  
Equity securities - corporate securities 62.1   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 241.8   204.6  
Fair Value, Measurements, Recurring | States and political subdivisions        
Assets:        
Fixed maturities, available for sale 2,628.7   2,246.7  
Fair Value, Measurements, Recurring | Foreign governments        
Assets:        
Fixed maturities, available for sale 104.3   95.6  
Fair Value, Measurements, Recurring | Asset-backed securities        
Assets:        
Fixed maturities, available for sale 1,117.4   1,387.9  
Total trading securities 10.4   12.1  
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 67.6   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 2,161.0   2,042.3  
Total trading securities 99.6   113.4  
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 1,951.4   1,887.0  
Total trading securities 129.9   118.0  
Fair Value, Measurements, Recurring | Collateralized loan obligations        
Assets:        
Fixed maturities, available for sale 460.1   400.8  
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 16.0   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 16.0   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  
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) | 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 | 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 | Significant other observable inputs (Level 2)        
Assets:        
Fixed maturities, available for sale 22,564.6   21,102.7  
Total trading securities 223.4   231.4  
Investments held by variable interest entities - corporate securities 1,172.6   1,188.6  
Other invested assets - derivatives 143.8   203.8  
Assets held in separate accounts 3.9   4.2  
Total assets carried at fair value by category 24,146.1   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 13,850.0   12,756.5  
Equity securities - corporate securities 37.8   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 241.8   204.6  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions        
Assets:        
Fixed maturities, available for sale 2,628.7   2,246.7  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments        
Assets:        
Fixed maturities, available for sale 104.3   94.5  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities        
Assets:        
Fixed maturities, available for sale 1,104.8   1,375.3  
Total trading securities 10.4   12.1  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 67.6   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 2,158.8   2,042.3  
Total trading securities 99.6   113.4  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities        
Assets:        
Fixed maturities, available for sale 1,951.4   1,887.0  
Total trading securities 113.0   105.5  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations        
Assets:        
Fixed maturities, available for sale 457.2   400.8  
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3)        
Assets:        
Fixed maturities, available for sale 138.3   192.5  
Total trading securities 16.9   12.5  
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 163.5   213.3  
Liabilities:        
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities) 1,598.9   1,565.4  
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Corporate securities        
Assets:        
Fixed maturities, available for sale 120.6   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  
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 2.2   0.0  
Total trading securities 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 16.9   12.5  
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Collateralized loan obligations        
Assets:        
Fixed maturities, available for sale $ 2.9   $ 0.0