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INCOME TAXES - NARRATIVE (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025
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Operating Loss Carryforwards [Line Items] |  |  |
Impact of change in tax method of accounting |  |  | $ 797.6
Deferred tax assets more likely than not to be realized through future taxable earnings | $ 731.8 | $ 711.7 |
Federal long-term tax exempt rate | 3.58% |  |
Ownership change threshold restricting NOL usage | 50.00% |  |
Net state operating loss carryforwards | $ 38.0 | 38.0 |
Capital loss carryforward | 55.9 | $ 53.7 |
NOLs with no expiration date |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 1,015.8 |  |
NOLs with no expiration date | Non-Life |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 848.3 |  |
NOLs with no expiration date | Life |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 167.5 |  |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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