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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities $ 377.2 $ 272.4  
Market risk benefit liability 52.6 60.0 $ 74.1
Significant unobservable inputs  (Level 3)      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total assets carried at fair value 76.5 76.4  
Total liabilities carried at fair value 1,651.0 1,531.6  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Market risk benefit liability $ 52.6 $ 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 0.0046 0.0045  
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 0.0344 0.1400  
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 0.1768 0.0209  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Partial withdrawal rates | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.0000 0.0000  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Partial withdrawal rates | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.0300 0.0300  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Partial withdrawal rates | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.0096 0.0063  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Mortality | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.0003 0.0003  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Mortality | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.3975 0.3841  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Mortality | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.0363 0.0464  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | GLWB utilization | 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 | GLWB utilization | 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 | GLWB utilization | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.2507 0.2495  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Non-performance risk spread | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.0009 0.0009  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Non-performance risk spread | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, market risk benefit, liability measurement input 0.0031 0.0035  
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 $ 1,598.4 $ 1,471.6  
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 0.0046 0.0045  
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 0.2336 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 0.0611 0.0581  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Partial withdrawal rates | 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 | Partial withdrawal rates | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0450 0.0450  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Partial withdrawal rates | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0278 0.0261  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Mortality | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0003 0.0003  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Mortality | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.3975 0.3841  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Mortality | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0405 0.0412  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | GLWB utilization | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0592 0.0592  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | GLWB utilization | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.4762 0.4762  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | GLWB utilization | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.2507 0.2495  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Option budget | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0090 0.0090  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Option budget | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0338 0.0337  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Option budget | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0264 0.0257  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Non-performance risk spread | Minimum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0009 0.0009  
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Non-performance risk spread | Maximum      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, liabilities 0.0031 0.0035  
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 $ 7.8 $ 8.1  
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins | Weighted Average      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable inputs, fixed maturities 0.0166 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 $ 3.7 $ 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, fixed maturities 0.6589    
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 $ 65.0 $ 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 10.4 14