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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)
$ in Millions
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities $ 120.5 $ 96.9  
Market risk benefit asset 96.4 75.4 $ 89.3
Market risk benefit liability 1.0 7.4 $ 3.1
Significant unobservable inputs  (Level 3)      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total assets carried at fair value by category 401.9 377.5  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Market risk benefit asset 96.4 75.4  
Market risk benefit liability $ 1.0 $ 7.4  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Surrender rates | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, assets measurement input 0.0145 0.0142  
Unobservable inputs, market risk benefit, liability measurement input 0.0145 0.0142  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Surrender rates | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, assets measurement input 0.1700 0.1525  
Unobservable inputs, market risk benefit, liability measurement input 0.1700 0.1525  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Surrender rates | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, assets measurement input 0.0438 0.0428  
Unobservable inputs, market risk benefit, liability measurement input 0.0438 0.0428  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Utilization rates | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, assets measurement input 0.0592 0.0592  
Unobservable inputs, market risk benefit, liability measurement input 0.0592 0.0592  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Utilization rates | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, assets measurement input 0.4762 0.4762  
Unobservable inputs, market risk benefit, liability measurement input 0.4762 0.4762  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Utilization rates | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, assets measurement input 0.2495 0.2488  
Unobservable inputs, market risk benefit, liability measurement input 0.2495 0.2488  
Significant unobservable inputs  (Level 3) | Recovery method | Percent of recovery expected | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, equity securities   0.0000  
Significant unobservable inputs  (Level 3) | Recovery method | Percent of recovery expected | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, equity securities   1.0000  
Significant unobservable inputs  (Level 3) | Recovery method | Percent of recovery expected | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, fixed maturities   0.2500  
Unobservable inputs, equity securities   1.0000  
Significant unobservable inputs  (Level 3) | Market comparables | EBITDA multiples | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, equity securities 9.8 11.3  
Significant unobservable inputs  (Level 3) | Unadjusted third-party price source      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other assets $ 222.3 $ 213.9  
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 indexed annuity products $ 1,551.9 $ 1,376.7  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rates | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0411 0.0385  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rates | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0583 0.0576  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rates | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0435 0.0441  
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 0.0452 0.0432  
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 0.0492 0.0492  
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 0.0469 0.0457  
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 0.0145 0.0142  
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 0.3010 0.2370  
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 0.0754 0.0692  
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   $ 2.9  
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rates | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, fixed maturities   0.0222  
Significant unobservable inputs  (Level 3) | Corporate securities | Recovery method      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturities, available for sale   $ 2.5  
Significant unobservable inputs  (Level 3) | Corporate securities | Unadjusted purchase price      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturities, available for sale $ 1.5 1.5  
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 $ 8.4 $ 8.6  
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins/rates | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, fixed maturities 0.0198 0.0224  
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities   $ 0.1  
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 $ 9.2 9.2  
Significant unobservable inputs  (Level 3) | Equity Securities | Market comparables      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities $ 64.1 $ 63.4