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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details) $ in Millions | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jan. 01, 2021 USD ($)
--- | --- | --- | --- | ---
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Equity securities - corporate securities | $ 95.5 | $ 135.3 |  |
Market risk benefit asset | 89.3 | 65.3 | $ 56.3 | $ 2.5
Market risk benefit liability | 3.1 | 11.3 | $ 13.7 | $ 114.8
Significant unobservable inputs (Level 3) |  |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total assets carried at fair value by category | 358.2 | 418.7 |  |
Significant unobservable inputs (Level 3) | Discounted cash flow analysis |  |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Market risk benefit asset | 89.3 | 65.3 |  |
Market risk benefit liability | $ 3.1 | $ 11.3 |  |
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 | 0.0128 | 0.0128 |  |
Unobservable inputs, market risk benefit, liability measurement input | 0.0128 | 0.0128 |  |
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 | 0.1105 | 0.1105 |  |
Unobservable inputs, market risk benefit, liability measurement input | 0.1105 | 0.1105 |  |
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 | 0.0368 | 0.0345 |  |
Unobservable inputs, market risk benefit, liability measurement input | 0.0368 | 0.0345 |  |
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 | 0.0678 |  |
Unobservable inputs, market risk benefit, liability measurement input | 0.0592 | 0.0678 |  |
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 | 0.6316 |  |
Unobservable inputs, market risk benefit, liability measurement input | 0.4762 | 0.6316 |  |
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 | 0.2254 | 0.2009 |  |
Unobservable inputs, market risk benefit, liability measurement input | 0.2254 | 0.2009 |  |
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, fixed maturities | 0.0000 | 0.0000 |  |
Unobservable inputs, equity securities | 0.0000 | 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, fixed maturities | 0.2500 | 0.3500 |  |
Unobservable inputs, equity securities | 1.0000 | 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 | 0.3500 |  |
Unobservable inputs, equity securities | 1.0000 | 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 | 10.7 | 8.5 |  |
Significant unobservable inputs (Level 3) | Unadjusted third-party price source |  |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Other assets | $ 166.0 | $ 249.0 |  |
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 | $ 1,213.4 | $ 1,297.0 |  |
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 | 0.0366 | 0.0377 |  |
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 | 0.0555 | 0.0548 |  |
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 | 0.0520 | 0.0447 |  |
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 | 0.0430 | 0.0430 |  |
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 | 0.0463 | 0.0463 |  |
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 | 0.0431 | 0.0431 |  |
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 | 0.0190 | 0.0190 |  |
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 | 0.2770 | 0.2770 |  |
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 | 0.0920 | 0.0920 |  |
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 | $ 2.7 | $ 2.9 |  |
Significant unobservable inputs (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rates | Minimum |  |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Unobservable inputs, fixed maturities |  | 0.0223 |  |
Significant unobservable inputs (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rates | Maximum |  |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Unobservable inputs, fixed maturities |  | 0.0394 |  |
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 | 0.0225 |  |
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 | $ 3.5 |  |
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 | 0.5 |  |
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 | $ 23.6 | $ 21.8 |  |
Significant unobservable inputs (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins/rates | Minimum |  |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Unobservable inputs, fixed maturities | 0.0223 | 0.0250 |  |
Significant unobservable inputs (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins/rates | Maximum |  |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Unobservable inputs, fixed maturities | 0.0339 | 0.0386 |  |
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 | 0.0298 | 0.0330 |  |
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 | $ 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 | 11.7 |  |
Significant unobservable inputs (Level 3) | Equity Securities | Market comparables |  |  |  |
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Equity securities - corporate securities | $ 63.3 | $ 63.9 |  |

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