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SEGMENT INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2024
Segment Reporting [Abstract] |
Summary of Underwriting Results of Reportable Segments | The following tables present the underwriting results of the Company's reportable segments, as well as the carrying amounts of allocated goodwill and intangible assets:
| At and year ended December 31, 2024 | Insurance |  | Reinsurance |  | Total |
| Gross premiums written | $ | 6,615,584 |  |  | $ | 2,390,304 |  |  | $ | 9,005,888 |  |
| Net premiums written | 4,250,545 |  |  | 1,506,806 |  |  | 5,757,351 |  |
| Net premiums earned | 3,926,036 |  |  | 1,380,199 |  |  | 5,306,235 |  |
| Other insurance related income | 94 |  |  | 30,627 |  |  | 30,721 |  |
| Current accident year net losses and loss expenses | (2,261,629) |  |  | (921,181) |  |  | (3,182,810) |  |
| Net favorable prior year reserve development | 16,209 |  |  | 8,114 |  |  | 24,323 |  |
| Acquisition costs | (766,915) |  |  | (303,636) |  |  | (1,070,551) |  |
| Underwriting-related general and administrative expenses | (485,929) |  |  | (50,513) |  |  | (536,442) |  |
| Underwriting income | $ | 427,866 |  |  | $ | 143,610 |  |  | 571,476 |  |
| Net investment income |  |  |  |  | 759,229 |  |
| Net investment gains (losses) |  |  |  |  | (138,534) |  |
| Corporate expenses |  |  |  |  | (129,760) |  |
| Foreign exchange gains |  |  |  |  | 50,822 |  |
| Interest expense and financing costs |  |  |  |  | (67,766) |  |
| Reorganization expenses |  |  |  |  | (26,312) |  |
| Amortization of intangible assets |  |  |  |  | (10,917) |  |
| Income before income taxes and interest in income of equity method investments |  |  |  |  | 1,008,238 |  |
| Income tax benefit |  |  |  |  | 55,595 |  |
| Interest in income of equity method investments |  |  |  |  | 17,953 |  |
| Net income |  |  |  |  | 1,081,786 |  |
| Preferred share dividends |  |  |  |  | 30,250 |  |
| Net income available to common shareholders |  |  |  |  | $ | 1,051,536 |  |
| Current accident year loss ratio | 57.6 | % |  | 66.7 | % |  | 60.0 | % |
| Prior year reserve development ratio | (0.4 | %) |  | (0.5 | %) |  | (0.5 | %) |
| Net losses and loss expenses ratio | 57.2 | % |  | 66.2 | % |  | 59.5 | % |
| Acquisition cost ratio | 19.5 | % |  | 22.0 | % |  | 20.2 | % |
| General and administrative expense ratio | 12.4 | % |  | 3.6 | % |  | 12.6 | % |
| Combined ratio | 89.1 | % |  | 91.8 | % |  | 92.3 | % |
| Goodwill and intangible assets | $ | 242,465 |  |  | $ | — |  |  | $ | 242,465 |  |
| At and year ended December 31, 2023 | Insurance |  | Reinsurance |  | Total |
| Gross premiums written | $ | 6,140,764 |  |  | $ | 2,215,761 |  |  | $ | 8,356,525 |  |
| Net premiums written | 3,758,720 |  |  | 1,343,605 |  |  | 5,102,325 |  |
| Net premiums earned | 3,461,700 |  |  | 1,622,081 |  |  | 5,083,781 |  |
| Other insurance related income (loss) | (198) |  |  | 22,693 |  |  | 22,495 |  |
| Current accident year net losses and loss expenses | (1,903,648) |  |  | (1,077,572) |  |  | (2,981,220) |  |
| Net favorable (adverse) prior year reserve development | (176,353) |  |  | (235,529) |  |  | (411,882) |  |
| Acquisition costs | (648,463) |  |  | (352,482) |  |  | (1,000,945) |  |
| Underwriting-related general and administrative expenses | (472,094) |  |  | (79,373) |  |  | (551,467) |  |
| Underwriting income (loss) | $ | 260,944 |  |  | $ | (100,182) |  |  | 160,762 |  |
| Net investment income |  |  |  |  | 611,742 |  |
| Net investment gains (losses) |  |  |  |  | (74,630) |  |
| Corporate expenses |  |  |  |  | (132,979) |  |
| Foreign exchange (losses) gains |  |  |  |  | (58,115) |  |
| Interest expense and financing costs |  |  |  |  | (68,421) |  |
| Reorganization expenses |  |  |  |  | (28,997) |  |
| Amortization of intangible assets |  |  |  |  | (10,917) |  |
| Income before income taxes and interest in income of equity method investments |  |  |  |  | 398,445 |  |
| Income tax (expense) benefit |  |  |  |  | (26,316) |  |
| Interest in income of equity method investments |  |  |  |  | 4,163 |  |
| Net income |  |  |  |  | 376,292 |  |
| Preferred share dividends |  |  |  |  | 30,250 |  |
| Net income available to common shareholders |  |  |  |  | $ | 346,042 |  |
| Current accident year loss ratio | 55.0 | % |  | 66.4 | % |  | 58.6 | % |
| Prior year reserve development ratio | 5.1 | % |  | 14.6 | % |  | 8.1 | % |
| Net losses and loss expenses ratio | 60.1 | % |  | 81.0 | % |  | 66.7 | % |
| Acquisition cost ratio | 18.7 | % |  | 21.7 | % |  | 19.7 | % |
| General and administrative expense ratio | 13.7 | % |  | 4.9 | % |  | 13.5 | % |
| Combined ratio | 92.5 | % |  | 107.6 | % |  | 99.9 | % |
| Goodwill and intangible assets | $ | 287,684 |  |  | $ | — |  |  | $ | 287,684 |  |
| At and year ended December 31, 2022 | Insurance |  | Reinsurance |  | Total |
| Gross premiums written | $ | 5,585,581 |  |  | $ | 2,629,014 |  |  | $ | 8,214,595 |  |
| Net premiums written | 3,377,906 |  |  | 1,885,150 |  |  | 5,263,056 |  |
| Net premiums earned | 3,134,155 |  |  | 2,026,171 |  |  | 5,160,326 |  |
| Other insurance related income | 559 |  |  | 12,514 |  |  | 13,073 |  |
| Current accident year net losses and loss expenses | (1,802,204) |  |  | (1,465,739) |  |  | (3,267,943) |  |
| Net favorable prior year reserve development | 16,350 |  |  | 9,183 |  |  | 25,533 |  |
| Acquisition costs | (577,838) |  |  | (444,179) |  |  | (1,022,017) |  |
| Underwriting-related general and administrative expenses | (443,704) |  |  | (106,585) |  |  | (550,289) |  |
| Underwriting income | $ | 327,318 |  |  | $ | 31,365 |  |  | 358,683 |  |
| Net investment income |  |  |  |  | 418,829 |  |
| Net investment gains (losses) |  |  |  |  | (456,789) |  |
| Corporate expenses |  |  |  |  | (130,054) |  |
| Foreign exchange gains |  |  |  |  | 157,945 |  |
| Interest expense and financing costs |  |  |  |  | (63,146) |  |
| Reorganization expenses |  |  |  |  | (31,426) |  |
| Amortization of intangible assets |  |  |  |  | (10,917) |  |
| Income before income taxes and interest in income of equity method investments |  |  |  |  | 243,125 |  |
| Income tax (expense) benefit |  |  |  |  | (22,037) |  |
| Interest in income of equity method investments |  |  |  |  | 1,995 |  |
| Net income |  |  |  |  | 223,083 |  |
| Preferred share dividends |  |  |  |  | 30,250 |  |
| Net income available to common shareholders |  |  |  |  | $ | 192,833 |  |
| Current accident year loss ratio | 57.5 | % |  | 72.3 | % |  | 63.3 | % |
| Prior year reserve development ratio | (0.5 | %) |  | (0.4 | %) |  | (0.5 | %) |
| Net losses and loss expenses ratio | 57.0 | % |  | 71.9 | % |  | 62.8 | % |
| Acquisition cost ratio | 18.4 | % |  | 21.9 | % |  | 19.8 | % |
| General and administrative expense ratio | 14.2 | % |  | 5.3 | % |  | 13.2 | % |
| Combined ratio | 89.6 | % |  | 99.1 | % |  | 95.8 | % |
| Goodwill and intangible assets | $ | 298,601 |  |  | $ | — |  |  | $ | 298,601 |  |
Summary of Gross Premiums Written by Geographical Location of Subsidiaries | The following table presents gross premiums written by the geographical location of the Company's subsidiaries:
| Years ended December 31, | 2024 |  | 2023 |  | 2022 |
| U.S. | $ | 4,864,074 |  |  | $ | 4,484,789 |  |  | $ | 4,342,707 |  |
| Ireland | 1,923,006 |  |  | 1,837,177 |  |  | 1,931,815 |  |
| Lloyd's of London | 1,998,217 |  |  | 1,759,990 |  |  | 1,567,458 |  |
| Bermuda | 220,591 |  |  | 274,569 |  |  | 372,615 |  |
| Gross premiums written | $ | 9,005,888 |  |  | $ | 8,356,525 |  |  | $ | 8,214,595 |  |
Summary of Net Premiums Earned by Segment and Line of Business | The following table presents net premiums earned by segment and line of business:
| Years ended December 31, | 2024 |  | 2023 |  | 2022 |
| Insurance |  |  |  |  |  |
| Professional lines | $ | 817,535 |  |  | $ | 764,558 |  |  | $ | 817,924 |  |
| Property | 1,139,308 |  |  | 878,849 |  |  | 755,986 |  |
| Liability | 494,561 |  |  | 496,381 |  |  | 459,775 |  |
| Cyber | 347,842 |  |  | 323,025 |  |  | 309,004 |  |
| Marine and aviation | 614,826 |  |  | 567,292 |  |  | 479,499 |  |
| Accident and health | 360,894 |  |  | 306,061 |  |  | 209,548 |  |
| Credit and political risk | 151,070 |  |  | 125,534 |  |  | 102,419 |  |
| Total Insurance | 3,926,036 |  |  | 3,461,700 |  |  | 3,134,155 |  |
| Reinsurance |  |  |  |  |  |
| Liability | 309,265 |  |  | 403,239 |  |  | 484,681 |  |
| Accident and health | 322,932 |  |  | 341,806 |  |  | 368,747 |  |
| Professional lines | 169,074 |  |  | 205,404 |  |  | 250,911 |  |
| Credit and surety | 231,780 |  |  | 236,408 |  |  | 192,926 |  |
| Motor | 123,545 |  |  | 155,942 |  |  | 205,774 |  |
| Agriculture | 126,549 |  |  | 121,628 |  |  | 122,289 |  |
| Marine and aviation | 64,609 |  |  | 65,658 |  |  | 78,504 |  |
| Run-off lines |  |  |  |  |  |
| Catastrophe | 13,412 |  |  | 33,963 |  |  | 156,232 |  |
| Property | 6,266 |  |  | 44,508 |  |  | 135,480 |  |
| Engineering | 12,767 |  |  | 13,525 |  |  | 30,627 |  |
| Total run-off lines | 32,445 |  |  | 91,996 |  |  | 322,339 |  |
| Total Reinsurance | 1,380,199 |  |  | 1,622,081 |  |  | 2,026,171 |  |
| Total | $ | 5,306,235 |  |  | $ | 5,083,781 |  |  | $ | 5,160,326 |  |

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