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GOODWILL AND INTANGIBLE ASSETS - Summary of Gross Amount and Accumulated Amortization by Category (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | $ 515,388 | $ 515,388 |  |
Accumulated amortization | (339,421) | (328,505) | $ (317,588) | $ (306,671)
Total | 175,967 | 186,883 |  |
U.S. state licenses |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 26,036 | 26,036 |  |
Total | 26,036 | 26,036 |  |
Novae | VOBA - Novae |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 256,942 | 256,942 |  |
Accumulated amortization | (256,942) | (256,942) |  |
Total | 0 | 0 |  |
Novae | Coverholders |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 63,565 | 63,565 |  |
Accumulated amortization | (38,408) | (33,110) |  |
Total | 25,157 | 30,455 |  |
Novae | Large brokers |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 46,641 | 46,641 |  |
Accumulated amortization | (22,545) | (19,435) |  |
Total | 24,096 | 27,206 |  |
Novae | SME brokers |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 14,126 | 14,126 |  |
Accumulated amortization | (8,533) | (7,357) |  |
Total | 5,593 | 6,769 |  |
Novae | Syndicate capacity |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 94,748 | 94,748 |  |
Total | 94,748 | 94,748 |  |
Tiernan | Customer relationships and customers lists - Ternian |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 13,330 | 13,330 |  |
Accumulated amortization | (12,993) | (11,661) |  |
Total | $ 337 | $ 1,669 |  |

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