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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jan. 01, 2020
Assets:      
Fixed maturities, available for sale $ 23,806.6 $ 23,383.6 $ 21,293.1
Equity securities - corporate securities 149.3 151.2  
Total trading securities 247.0 232.0  
Investments held by variable interest entities - corporate securities 1,233.5 1,189.4 $ 1,178.7
Assets held in separate accounts 4.5 4.2  
Corporate securities      
Assets:      
Fixed maturities, available for sale 15,243.5 14,739.2  
United States Treasury securities and obligations of United States government corporations and agencies      
Assets:      
Fixed maturities, available for sale 214.6 235.5  
States and political subdivisions      
Assets:      
Fixed maturities, available for sale 2,800.9 2,653.9  
Foreign governments      
Assets:      
Fixed maturities, available for sale 80.0 102.8  
Asset-backed securities      
Assets:      
Fixed maturities, available for sale 1,012.1 1,062.1  
Agency residential mortgage-backed securities      
Assets:      
Fixed maturities, available for sale 49.6 58.4  
Non-agency residential mortgage-backed securities      
Assets:      
Fixed maturities, available for sale 1,905.3 2,092.6  
Collateralized loan obligations      
Assets:      
Fixed maturities, available for sale 459.6 458.9  
Commercial mortgage-backed securities      
Assets:      
Fixed maturities, available for sale 2,041.0 1,980.2  
Significant unobservable inputs  (Level 3)      
Assets:      
Total assets carried at fair value by category 138.9 212.5  
Fair Value, Measurements, Recurring      
Assets:      
Fixed maturities, available for sale 23,806.6 23,383.6  
Total trading securities 247.0 232.0  
Investments held by variable interest entities - corporate securities 1,233.5 1,189.4  
Other invested assets - derivatives 255.8 216.7  
Assets held in separate accounts 4.5 4.2  
Total assets carried at fair value by category 25,696.7 25,177.1  
Liabilities:      
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities) 1,695.0 1,644.5  
Fair Value, Measurements, Recurring | Corporate securities      
Assets:      
Fixed maturities, available for sale 15,243.5 14,739.2  
Equity securities - corporate securities 149.3 151.2  
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies      
Assets:      
Fixed maturities, available for sale 214.6 235.5  
Fair Value, Measurements, Recurring | States and political subdivisions      
Assets:      
Fixed maturities, available for sale 2,800.9 2,653.9  
Fair Value, Measurements, Recurring | Foreign governments      
Assets:      
Fixed maturities, available for sale 80.0 102.8  
Fair Value, Measurements, Recurring | Asset-backed securities      
Assets:      
Fixed maturities, available for sale 1,012.1 1,062.1  
Total trading securities 7.9 10.4  
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities      
Assets:      
Fixed maturities, available for sale 49.6 58.4  
Total trading securities 0.4 0.4  
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities      
Assets:      
Fixed maturities, available for sale 1,905.3 2,092.6  
Total trading securities 90.1 97.9  
Fair Value, Measurements, Recurring | Collateralized loan obligations      
Assets:      
Fixed maturities, available for sale 459.6 458.9  
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities      
Assets:      
Fixed maturities, available for sale 2,041.0 1,980.2  
Total trading securities 148.6 123.3  
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 102.5 104.6  
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 102.5 104.6  
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:      
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) | 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 23,712.1 23,220.8  
Total trading securities 229.6 209.1  
Investments held by variable interest entities - corporate securities 1,233.5 1,189.4  
Other invested assets - derivatives 255.8 216.7  
Assets held in separate accounts 4.5 4.2  
Total assets carried at fair value by category 25,455.3 24,860.0  
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 15,161.0 14,592.3  
Equity securities - corporate securities 19.8 19.8  
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 214.6 235.5  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions      
Assets:      
Fixed maturities, available for sale 2,800.9 2,653.9  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments      
Assets:      
Fixed maturities, available for sale 80.0 102.8  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities      
Assets:      
Fixed maturities, available for sale 1,000.1 1,047.8  
Total trading securities 7.9 10.4  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities      
Assets:      
Fixed maturities, available for sale 49.6 58.4  
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 1,905.3 2,091.0  
Total trading securities 85.3 92.0  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations      
Assets:      
Fixed maturities, available for sale 459.6 458.9  
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities      
Assets:      
Fixed maturities, available for sale 2,041.0 1,980.2  
Total trading securities 136.0 106.3  
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3)      
Assets:      
Fixed maturities, available for sale 94.5 162.8  
Total trading securities 17.4 22.9  
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 138.9 212.5  
Liabilities:      
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities) 1,695.0 1,644.5  
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Corporate securities      
Assets:      
Fixed maturities, available for sale 82.5 146.9  
Equity securities - corporate securities 27.0 26.8  
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 0.0  
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Asset-backed securities      
Assets:      
Fixed maturities, available for sale 12.0 14.3  
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 1.6  
Total trading securities 4.8 5.9  
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 $ 12.6 $ 17.0