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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 |

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