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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 |

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