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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 |

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