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SEGMENT INFORMATION - Summary of Underwriting Results of Reportable Segments (Details) $ in Thousands | 12 Months Ended |
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Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of reportable segments | segment | 2 |  |  |
Segment Information [Line Items] |  |  |  |
Gross premiums written | $ 9,005,888 | $ 8,356,525 | $ 8,214,595 |
Net premiums written | 5,757,351 | 5,102,325 | 5,263,056 |
Net premiums earned | 5,306,235 | 5,083,781 | 5,160,326 |
Other insurance related income | 30,721 | 22,495 | 13,073 |
Current accident year net losses and loss expenses | (3,182,810) | (2,981,220) | (3,267,943) |
Net favorable prior year reserve development | 24,323 | (411,882) | 25,533 |
Acquisition costs | (1,070,551) | (1,000,945) | (1,022,017) |
Underwriting-related general and administrative expenses | (666,202) | (684,446) | (680,343) |
Net investment income | 759,229 | 611,742 | 418,829 |
Net investment gains (losses) | (138,534) | (74,630) | (456,789) |
Foreign exchange gains | 50,822 | (58,115) | 157,945 |
Interest expense and financing costs | (67,766) | (68,421) | (63,146) |
Reorganization expenses | (26,312) | (28,997) | (31,426) |
Amortization of intangible assets | (10,917) | (10,917) | (10,917) |
Income before income taxes and interest in income of equity method investments | 1,008,238 | 398,445 | 243,125 |
Income tax benefit | 55,595 | (26,316) | (22,037) |
Interest in income of equity method investments | 17,953 | 4,163 | 1,995 |
Net income | 1,081,786 | 376,292 | 223,083 |
Preferred share dividends | 30,250 | 30,250 | 30,250 |
Net income available to common shareholders | 1,051,536 | 346,042 | 192,833 |
Goodwill and intangible assets | 242,465 | 287,685 | 298,602 | $ 309,519
Insurance |  |  |  |
Segment Information [Line Items] |  |  |  |
Net favorable prior year reserve development | 16,209 | (176,353) | 16,350 |
Reinsurance |  |  |  |
Segment Information [Line Items] |  |  |  |
Net favorable prior year reserve development | 8,114 | (235,529) | 9,183 |
Operating Segments |  |  |  |
Segment Information [Line Items] |  |  |  |
Gross premiums written | 9,005,888 | 8,356,525 | 8,214,595 |
Net premiums written | 5,757,351 | 5,102,325 | 5,263,056 |
Net premiums earned | 5,306,235 | 5,083,781 | 5,160,326 |
Other insurance related income | 30,721 | 22,495 | 13,073 |
Current accident year net losses and loss expenses | (3,182,810) | (2,981,220) | (3,267,943) |
Acquisition costs | (1,070,551) | (1,000,945) | (1,022,017) |
Underwriting-related general and administrative expenses | (536,442) | (551,467) | (550,289) |
Underwriting income | $ 571,476 | $ 160,762 | $ 358,683 |
Current accident year loss ratio | 60.00% | 58.60% | 63.30% |
Prior year reserve development ratio | (0.50%) | 8.10% | (0.50%) |
Net losses and loss expenses ratio | 59.50% | 66.70% | 62.80% |
Acquisition cost ratio | 20.20% | 19.70% | 19.80% |
General and administrative expense ratio | 12.60% | 13.50% | 13.20% |
Combined ratio | 92.30% | 99.90% | 95.80% |
Goodwill and intangible assets | $ 242,465 | $ 287,684 | $ 298,601 |
Operating Segments | Insurance |  |  |  |
Segment Information [Line Items] |  |  |  |
Gross premiums written | 6,615,584 | 6,140,764 | 5,585,581 |
Net premiums written | 4,250,545 | 3,758,720 | 3,377,906 |
Net premiums earned | 3,926,036 | 3,461,700 | 3,134,155 |
Other insurance related income | 94 | (198) | 559 |
Current accident year net losses and loss expenses | (2,261,629) | (1,903,648) | (1,802,204) |
Acquisition costs | (766,915) | (648,463) | (577,838) |
Underwriting-related general and administrative expenses | (485,929) | (472,094) | (443,704) |
Underwriting income | $ 427,866 | $ 260,944 | $ 327,318 |
Current accident year loss ratio | 57.60% | 55.00% | 57.50% |
Prior year reserve development ratio | (0.40%) | 5.10% | (0.50%) |
Net losses and loss expenses ratio | 57.20% | 60.10% | 57.00% |
Acquisition cost ratio | 19.50% | 18.70% | 18.40% |
General and administrative expense ratio | 12.40% | 13.70% | 14.20% |
Combined ratio | 89.10% | 92.50% | 89.60% |
Goodwill and intangible assets | $ 242,465 | $ 287,684 | $ 298,601 |
Operating Segments | Reinsurance |  |  |  |
Segment Information [Line Items] |  |  |  |
Gross premiums written | 2,390,304 | 2,215,761 | 2,629,014 |
Net premiums written | 1,506,806 | 1,343,605 | 1,885,150 |
Net premiums earned | 1,380,199 | 1,622,081 | 2,026,171 |
Other insurance related income | 30,627 | 22,693 | 12,514 |
Current accident year net losses and loss expenses | (921,181) | (1,077,572) | (1,465,739) |
Acquisition costs | (303,636) | (352,482) | (444,179) |
Underwriting-related general and administrative expenses | (50,513) | (79,373) | (106,585) |
Underwriting income | $ 143,610 | $ (100,182) | $ 31,365 |
Current accident year loss ratio | 66.70% | 66.40% | 72.30% |
Prior year reserve development ratio | (0.50%) | 14.60% | (0.40%) |
Net losses and loss expenses ratio | 66.20% | 81.00% | 71.90% |
Acquisition cost ratio | 22.00% | 21.70% | 21.90% |
General and administrative expense ratio | 3.60% | 4.90% | 5.30% |
Combined ratio | 91.80% | 107.60% | 99.10% |
Goodwill and intangible assets | $ 0 | $ 0 | $ 0 |
Significant Reconciling Items |  |  |  |
Segment Information [Line Items] |  |  |  |
Net investment income | 759,229 | 611,742 | 418,829 |
Net investment gains (losses) | (138,534) | (74,630) | (456,789) |
Foreign exchange gains | 50,822 | (58,115) | 157,945 |
Interest expense and financing costs | (67,766) | (68,421) | (63,146) |
Reorganization expenses | (26,312) | (28,997) | (31,426) |
Amortization of intangible assets | (10,917) | (10,917) | (10,917) |
Corporate |  |  |  |
Segment Information [Line Items] |  |  |  |
Underwriting-related general and administrative expenses | $ (129,760) | $ (132,979) | $ (130,054) |

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