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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Gross premiums written $ 3,421,180 $ 3,425,495 $ 7,576,683 $ 7,416,179
Net premiums written 2,770,270 2,838,511 6,213,799 6,038,084
Net premiums earned 2,412,154 2,541,315 5,132,935 4,985,225
Net claims and claim expenses incurred 1,042,123 1,309,502 3,785,881 2,475,625
Acquisition expenses 642,605 644,438 1,290,040 1,275,359
Operational expenses 125,738 108,039 225,923 214,223
Underwriting income (loss) 601,688 479,336 (168,909) 1,020,018
Net investment income 413,108 410,845 818,461 801,620
Net foreign exchange gains (losses) 8,660 (8,815) 1,332 (44,498)
Equity in earnings (losses) of other ventures 20,333 12,590 38,161 26,717
Other income (loss) 2,624 169 3,538 119
Net realized and unrealized gains (losses) on investments 349,720 (127,584) 682,660 (341,238)
Corporate expenses (23,781) (35,159) (46,591) (74,411)
Interest expense (31,793) (23,609) (58,879) (46,713)
Income (loss) before taxes 1,340,559 707,773 1,269,773 1,341,614
Income tax benefit (expense) (176,869) 20,848 (131,344) 5,476
Net (income) loss attributable to redeemable noncontrolling interests (328,339) (224,731) (133,087) (469,558)
Dividends on preference shares (8,844) (8,844) (17,688) (17,688)
Net income (loss) available (attributable) to RenaissanceRe common shareholders 826,507 495,046 987,654 859,844
Net claims and claim expenses incurred – current accident year 1,311,833 1,417,773 4,251,465 2,680,977
Net claims and claim expenses incurred – prior accident years (269,710) (108,271) (465,584) (205,352)
Total net incurred $ 1,042,123 $ 1,309,502 $ 3,785,881 $ 2,475,625
Net claims and claim expense ratio – current accident year 54.40% 55.80% 82.80% 53.80%
Net claims and claim expense ratio – prior accident years (11.20%) (4.30%) (9.00%) (4.10%)
Net claims and claim expense ratio – calendar year 43.20% 51.50% 73.80% 49.70%
Underwriting expense ratio 31.90% 29.60% 29.50% 29.80%
Combined ratio 75.10% 81.10% 103.30% 79.50%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ 0 $ 0
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Net claims and claim expenses incurred 0 0 0 0
Acquisition expenses 0 0 0 0
Operational expenses 0 0 0 0
Underwriting income (loss) 0 0 0 0
Net investment income 413,108 410,845 818,461 801,620
Net foreign exchange gains (losses) 8,660 (8,815) 1,332 (44,498)
Equity in earnings (losses) of other ventures 20,333 12,590 38,161 26,717
Other income (loss) 2,624 169 3,538 119
Net realized and unrealized gains (losses) on investments 349,720 (127,584) 682,660 (341,238)
Corporate expenses (23,781) (35,159) (46,591) (74,411)
Interest expense (31,793) (23,609) (58,879) (46,713)
Income tax benefit (expense) (176,869) 20,848 (131,344) 5,476
Net (income) loss attributable to redeemable noncontrolling interests (328,339) (224,731) (133,087) (469,558)
Dividends on preference shares (8,844) (8,844) (17,688) (17,688)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years 0 0 0 0
Total net incurred 0 0 0 0
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     (453,634) (179,058)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 1,731,935 1,753,098 3,862,768 3,642,979
Net premiums written 1,325,557 1,358,660 3,016,551 2,756,278
Net premiums earned 868,010 980,834 2,115,960 1,916,917
Net claims and claim expenses incurred (7,930) 273,354 1,615,327 427,603
Acquisition expenses 174,200 188,345 341,845 374,127
Operational expenses 71,569 67,425 135,835 129,049
Underwriting income (loss) 630,171 451,710 22,953 986,138
Net claims and claim expenses incurred – current accident year 258,646 357,745 2,068,961 606,661
Net claims and claim expenses incurred – prior accident years (266,576) (84,391) (453,634) (179,058)
Total net incurred $ (7,930) $ 273,354 $ 1,615,327 $ 427,603
Net claims and claim expense ratio – current accident year 29.80% 36.50% 97.80% 31.60%
Net claims and claim expense ratio – prior accident years (30.70%) (8.60%) (21.50%) (9.30%)
Net claims and claim expense ratio – calendar year (0.90%) 27.90% 76.30% 22.30%
Underwriting expense ratio 28.30% 26.00% 22.60% 26.30%
Combined ratio 27.40% 53.90% 98.90% 48.60%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (11,950) $ (26,294)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 1,689,245 $ 1,672,397 3,713,915 3,773,200
Net premiums written 1,444,713 1,479,851 3,197,248 3,281,806
Net premiums earned 1,544,144 1,560,481 3,016,975 3,068,308
Net claims and claim expenses incurred 1,050,053 1,036,148 2,170,554 2,048,022
Acquisition expenses 468,405 456,093 948,195 901,232
Operational expenses 54,169 40,614 90,088 85,174
Underwriting income (loss) (28,483) 27,626 (191,862) 33,880
Net claims and claim expenses incurred – current accident year 1,053,187 1,060,028 2,182,504 2,074,316
Net claims and claim expenses incurred – prior accident years (3,134) (23,880) (11,950) (26,294)
Total net incurred $ 1,050,053 $ 1,036,148 $ 2,170,554 $ 2,048,022
Net claims and claim expense ratio – current accident year 68.20% 67.90% 72.30% 67.60%
Net claims and claim expense ratio – prior accident years (0.20%) (1.50%) (0.40%) (0.90%)
Net claims and claim expense ratio – calendar year 68.00% 66.40% 71.90% 66.70%
Underwriting expense ratio 33.80% 31.80% 34.50% 32.20%
Combined ratio 101.80% 98.20% 106.40% 98.90%