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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Gross premiums written $ 2,400,136 $ 1,618,443 $ 9,816,315 $ 7,060,325
Net premiums written 2,162,504 1,421,260 8,200,588 5,880,766
Net premiums earned 2,582,969 1,755,876 7,568,194 5,221,688
Net claims and claim expenses incurred 1,373,614 861,576 3,849,239 2,593,987
Acquisition expenses 690,338 425,745 1,965,697 1,280,547
Operational expenses 125,261 82,751 339,484 240,716
Underwriting income (loss) 393,756 385,804 1,413,774 1,106,438
Net investment income 423,859 329,108 1,225,479 876,148
Net foreign exchange gains (losses) 16,804 (25,886) (27,694) (53,877)
Equity in earnings of other ventures 5,718 10,842 32,435 28,072
Other income (loss) 680 (5,866) 799 (6,296)
Net realized and unrealized gains (losses) on investments 943,745 (228,087) 602,507 (171,417)
Corporate expenses (26,078) (17,143) (100,489) (53,357)
Interest expense (23,809) (22,951) (70,522) (49,980)
Income (loss) before taxes 1,734,675 425,821 3,076,289 1,675,731
Income tax benefit (expense) (102,012) (9,295) (96,536) (44,139)
Net (income) loss attributable to redeemable noncontrolling interests (450,176) (213,695) (919,734) (655,986)
Dividends on preference shares (8,843) (8,843) (26,531) (26,531)
Net income (loss) available (attributable) to RenaissanceRe common shareholders 1,173,644 193,988 2,033,488 949,075
Net income (loss) available (attributable) to RenaissanceRe common shareholders, diluted 1,173,644 193,988 2,033,488 949,075
Net claims and claim expenses incurred – current accident year 1,666,120 1,019,523 4,347,097 2,888,784
Net claims and claim expenses incurred – prior accident years (292,506) (157,947) (497,858) (294,797)
Total net incurred $ 1,373,614 $ 861,576 $ 3,849,239 $ 2,593,987
Net claims and claim expense ratio – current accident year 64.50% 58.10% 57.40% 55.30%
Net claims and claim expense ratio – prior accident years (11.30%) (9.00%) (6.50%) (5.60%)
Net claims and claim expense ratio – calendar year 53.20% 49.10% 50.90% 49.70%
Underwriting expense ratio 31.60% 28.90% 30.40% 29.10%
Combined ratio 84.80% 78.00% 81.30% 78.80%
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 423,859 329,108 1,225,479 876,148
Net foreign exchange gains (losses) 16,804 (25,886) (27,694) (53,877)
Equity in earnings of other ventures 5,718 10,842 32,435 28,072
Other income (loss) 680 (5,866) 799 (6,296)
Net realized and unrealized gains (losses) on investments 943,745 (228,087) 602,507 (171,417)
Corporate expenses (26,078) (17,143) (100,489) (53,357)
Interest expense (23,809) (22,951) (70,522) (49,980)
Income tax benefit (expense) (102,012) (9,295) (96,536) (44,139)
Net (income) loss attributable to redeemable noncontrolling interests (450,176) (213,695) (919,734) (655,986)
Dividends on preference shares (8,843) (8,843) (26,531) (26,531)
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     (470,801) (257,209)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 790,709 511,012 4,433,688 3,217,817
Net premiums written 701,222 444,872 3,457,500 2,609,356
Net premiums earned 994,777 760,365 2,911,694 2,206,471
Net claims and claim expenses incurred 329,967 206,361 757,570 675,963
Acquisition expenses 192,439 143,348 566,566 429,273
Operational expenses 77,688 54,624 206,737 165,514
Underwriting income (loss) 394,683 356,032 1,380,821 935,721
Net claims and claim expenses incurred – current accident year 621,710 350,238 1,228,371 933,172
Net claims and claim expenses incurred – prior accident years (291,743) (143,877) (470,801) (257,209)
Total net incurred $ 329,967 $ 206,361 $ 757,570 $ 675,963
Net claims and claim expense ratio – current accident year 62.50% 46.10% 42.20% 42.30%
Net claims and claim expense ratio – prior accident years (29.30%) (19.00%) (16.20%) (11.70%)
Net claims and claim expense ratio – calendar year 33.20% 27.10% 26.00% 30.60%
Underwriting expense ratio 27.10% 26.10% 26.60% 27.00%
Combined ratio 60.30% 53.20% 52.60% 57.60%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (27,057) $ (37,588)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 1,609,427 $ 1,107,431 5,382,627 3,842,508
Net premiums written 1,461,282 976,388 4,743,088 3,271,410
Net premiums earned 1,588,192 995,511 4,656,500 3,015,217
Net claims and claim expenses incurred 1,043,647 655,215 3,091,669 1,918,024
Acquisition expenses 497,899 282,397 1,399,131 851,274
Operational expenses 47,573 28,127 132,747 75,202
Underwriting income (loss) (927) 29,772 32,953 170,717
Net claims and claim expenses incurred – current accident year 1,044,410 669,285 3,118,726 1,955,612
Net claims and claim expenses incurred – prior accident years (763) (14,070) (27,057) (37,588)
Total net incurred $ 1,043,647 $ 655,215 $ 3,091,669 $ 1,918,024
Net claims and claim expense ratio – current accident year 65.80% 67.20% 67.00% 64.90%
Net claims and claim expense ratio – prior accident years (0.10%) (1.40%) (0.60%) (1.30%)
Net claims and claim expense ratio – calendar year 65.70% 65.80% 66.40% 63.60%
Underwriting expense ratio 34.40% 31.20% 32.90% 30.70%
Combined ratio 100.10% 97.00% 99.30% 94.30%