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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details) $ in Millions | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
--- | --- | --- | ---
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Equity securities - corporate securities | $ 120.5 | $ 96.9 |
Market risk benefit asset | 96.4 | 75.4 | $ 89.3
Market risk benefit liability | 1.0 | 7.4 | $ 3.1
Significant unobservable inputs (Level 3) |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Total assets carried at fair value by category | 401.9 | 377.5 |
Significant unobservable inputs (Level 3) | Discounted cash flow analysis |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Market risk benefit asset | 96.4 | 75.4 |
Market risk benefit liability | $ 1.0 | $ 7.4 |
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, assets measurement input | 0.0145 | 0.0142 |
Unobservable inputs, market risk benefit, liability measurement input | 0.0145 | 0.0142 |
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, assets measurement input | 0.1700 | 0.1525 |
Unobservable inputs, market risk benefit, liability measurement input | 0.1700 | 0.1525 |
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, assets measurement input | 0.0438 | 0.0428 |
Unobservable inputs, market risk benefit, liability measurement input | 0.0438 | 0.0428 |
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, assets measurement input | 0.0592 | 0.0592 |
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, assets measurement input | 0.4762 | 0.4762 |
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, assets measurement input | 0.2495 | 0.2488 |
Unobservable inputs, market risk benefit, liability measurement input | 0.2495 | 0.2488 |
Significant unobservable inputs (Level 3) | Recovery method | Percent of recovery expected | Minimum |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unobservable inputs, equity securities |  | 0.0000 |
Significant unobservable inputs (Level 3) | Recovery method | Percent of recovery expected | Maximum |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unobservable inputs, equity securities |  | 1.0000 |
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 |  | 0.2500 |
Unobservable inputs, equity securities |  | 1.0000 |
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 | 9.8 | 11.3 |
Significant unobservable inputs (Level 3) | Unadjusted third-party price source |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Other assets | $ 222.3 | $ 213.9 |
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 | $ 1,551.9 | $ 1,376.7 |
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 | 0.0411 | 0.0385 |
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 | 0.0583 | 0.0576 |
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 | 0.0435 | 0.0441 |
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 | 0.0432 |
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 | 0.0457 |
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 | 0.0142 |
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 | 0.2370 |
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 | 0.0692 |
Significant unobservable inputs (Level 3) | Corporate securities | Discounted cash flow analysis |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fixed maturities, available for sale |  | $ 2.9 |
Significant unobservable inputs (Level 3) | Corporate 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 |  | 0.0222 |
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 |  | $ 2.5 |
Significant unobservable inputs (Level 3) | Corporate securities | Unadjusted purchase price |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fixed maturities, available for sale | $ 1.5 | 1.5 |
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 | $ 8.4 | $ 8.6 |
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 | 0.0198 | 0.0224 |
Significant unobservable inputs (Level 3) | Equity Securities | Recovery method |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Equity securities - corporate securities |  | $ 0.1 |
Significant unobservable inputs (Level 3) | Equity Securities | Unadjusted purchase price |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Equity securities - corporate securities | $ 9.2 | 9.2 |
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 | $ 63.4 |

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