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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)
$ in Millions
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities $ 332.8 $ 389.2  
Market risk benefit liability 58.1 48.1 $ 73.6
Significant unobservable inputs  (Level 3)      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total assets carried at fair value by category 75.8 76.1  
Total liabilities carried at fair value 1,622.3 1,648.7  
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Market risk benefit liability $ 58.1 $ 48.1  
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 0.0046  
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 0.1768 0.1768  
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 0.0344 0.0344  
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 0.0096  
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 0.3975  
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 0.0363  
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 0.2507  
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 0.0037 0.0031  
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   0.5000  
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 $ 1,564.2 $ 1,600.6  
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 0.0046  
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 0.2336  
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 0.0611  
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 0.0278  
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 0.3975  
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 0.0405  
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 0.2507  
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 0.0338  
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 0.0264  
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 0.0037 0.0031  
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 $ 0.3 $ 0.5  
Unobservable inputs, fixed maturities 0.2500    
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 $ 7.4 $ 7.6  
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 0.0163 0.0161  
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 $ 3.5 $ 3.5  
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 0.6144    
Unobservable inputs, equity securities   0.6124  
Significant unobservable inputs  (Level 3) | Equity Securities | Market comparables      
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Equity securities - corporate securities $ 64.6 $ 64.5  
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 11.3 10.9