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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)
$ in Millions
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities $ 349.1 $ 162.0  
Market risk benefit liability 73.6 60.0 $ 99.6
Significant unobservable inputs  (Level 3)      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total assets carried at fair value by category 76.4 76.4  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Market risk benefit liability $ 73.6 $ 60.0  
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, liability measurement input 0.0145 0.0145  
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, liability measurement input 0.1700 0.1700  
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, liability measurement input 0.0438 0.0438  
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, 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, 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, liability measurement input 0.2495 0.2495  
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 12.8    
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 $ 1,481.9 $ 1,493.2  
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 0.0408 0.0421  
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 0.0619 0.0588  
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 0.0481 0.0504  
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 0.0452  
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 0.0469  
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 0.0145  
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 0.3010  
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 0.0754  
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Percent of recovery expected | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, fixed maturities 0.7360    
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 $ 8.1 $ 8.1  
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 0.0155 0.0149  
Significant unobservable inputs  (Level 3) | Asset-backed securities | Recovery method      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fixed maturities, available for sale $ 4.2 $ 4.1  
Significant unobservable inputs  (Level 3) | Asset-backed securities | Recovery method | Percent of recovery expected | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, equity securities   0.713  
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 $ 64.2  
Significant unobservable inputs  (Level 3) | Equity Securities | Market comparables | EBITDA multiples | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, equity securities   14