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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturities, available for sale $ 23,806.6 $ 23,383.6 $ 21,293.1
Equity securities - corporate securities 149.3 151.2  
Corporate securities      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturities, available for sale 15,243.5 14,739.2  
Asset-backed securities      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturities, available for sale 1,012.1 1,062.1  
Significant unobservable inputs  (Level 3)      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total assets carried at fair value by category 138.9 212.5  
Significant unobservable inputs  (Level 3) | Unadjusted third-party price source      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other assets 94.6 159.9  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Embedded derivatives related to fixed index annuity products $ 1,695.0 $ 1,644.5  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rate | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0000 0.0000  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rate | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0330 0.0264  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rate | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0169 0.0103  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Projected portfolio yields | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0412 0.0412  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Projected portfolio yields | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0438 0.0438  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Projected portfolio yields | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0413 0.0413  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Surrender rates | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0160 0.0160  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Surrender rates | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.2560 0.2560  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Surrender rates | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0940 0.0940  
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturities, available for sale $ 5.3 $ 13.4  
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rate | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, assets 0.0328 0.0190  
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rate | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, assets 0.0449 0.0559  
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rate | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, assets 0.0333 0.0324  
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturities, available for sale $ 12.0 $ 12.3  
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins/rate      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, assets 0.0170 0.0246  
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities $ 8.3 $ 8.3  
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method | Percent of recovery expected | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, assets   0.5927  
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method | Percent of recovery expected | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, assets   1.0000  
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method | Percent of recovery expected | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, assets 1.0000 0.5952  
Significant unobservable inputs  (Level 3) | Equity Securities | Unadjusted purchase price      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities $ 18.7 $ 18.6