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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities $ 162.0 $ 96.9
Market risk benefit liability 60.0 117.1
Significant unobservable inputs  (Level 3)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets carried at fair value by category 324.7 302.1
Residual tranches amount 92.7 28.9
Unfunded commitments $ 26.0 $ 26.2
Investments, liquidation period 10 years 10 years
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefit liability $ 60.0 $ 117.1
Significant unobservable inputs  (Level 3) | Unadjusted third-party price source    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Other assets categorized as Level 3 237.6 213.9
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives at fair value $ 1,493.2 $ 1,376.7
Significant unobservable inputs  (Level 3) | Discount margins | Discounted projected embedded derivatives | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.0421 0.0385
Significant unobservable inputs  (Level 3) | Discount margins | Discounted projected embedded derivatives | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.0588 0.0576
Significant unobservable inputs  (Level 3) | Discount margins | Discounted projected embedded derivatives | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.0504 0.0441
Significant unobservable inputs  (Level 3) | Percent of recovery expected | Recovery method | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities inputs   0.0000
Significant unobservable inputs  (Level 3) | Percent of recovery expected | Recovery method | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities inputs   1.0000
Significant unobservable inputs  (Level 3) | Percent of recovery expected | Recovery method | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities inputs   1.0000
Significant unobservable inputs  (Level 3) | EBITDA multiples | Market comparables | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities inputs 14 11.3
Significant unobservable inputs  (Level 3) | Surrender rates | Discounted cash flow analysis | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefit liability inputs 0.0145 0.0142
Significant unobservable inputs  (Level 3) | Surrender rates | Discounted cash flow analysis | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefit liability inputs 0.1700 0.1525
Significant unobservable inputs  (Level 3) | Surrender rates | Discounted cash flow analysis | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefit liability inputs 0.0438 0.0428
Significant unobservable inputs  (Level 3) | Surrender rates | Discounted projected embedded derivatives | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.0145 0.0142
Significant unobservable inputs  (Level 3) | Surrender rates | Discounted projected embedded derivatives | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.3010 0.2370
Significant unobservable inputs  (Level 3) | Surrender rates | Discounted projected embedded derivatives | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.0754 0.0692
Significant unobservable inputs  (Level 3) | Utilization rates | Discounted cash flow analysis | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefit liability inputs 0.0592 0.0592
Significant unobservable inputs  (Level 3) | Utilization rates | Discounted cash flow analysis | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefit liability inputs 0.4762 0.4762
Significant unobservable inputs  (Level 3) | Utilization rates | Discounted cash flow analysis | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefit liability inputs 0.2495 0.2488
Significant unobservable inputs  (Level 3) | Projected portfolio yields | Discounted projected embedded derivatives | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.0452 0.0432
Significant unobservable inputs  (Level 3) | Projected portfolio yields | Discounted projected embedded derivatives | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.0492 0.0492
Significant unobservable inputs  (Level 3) | Projected portfolio yields | Discounted projected embedded derivatives | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Embedded derivatives related to fixed index annuity products inputs 0.0469 0.0457
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities   $ 2.9
Significant unobservable inputs  (Level 3) | Corporate securities | Recovery method    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities   2.5
Significant unobservable inputs  (Level 3) | Corporate securities | Unadjusted purchase price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities $ 1.5 $ 1.5
Significant unobservable inputs  (Level 3) | Corporate securities | Discount margins | Discounted cash flow analysis | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities inputs   2.22
Significant unobservable inputs  (Level 3) | Corporate securities | Percent of recovery expected | Recovery method | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities inputs   25.00
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities 8.1 $ 8.6
Significant unobservable inputs  (Level 3) | Asset-backed securities | Recovery method    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities $ 4.1  
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discount margins | Discounted cash flow analysis | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities inputs 0.0149 2.24
Significant unobservable inputs  (Level 3) | Asset-backed securities | Percent of recovery expected | Recovery method | Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Corporate and asset-backed securities inputs 0.713  
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities   $ 0.1
Significant unobservable inputs  (Level 3) | Equity Securities | Unadjusted purchase price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities $ 9.2 9.2
Significant unobservable inputs  (Level 3) | Equity Securities | Market comparables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Equity securities $ 64.2 $ 63.4