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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Gross premiums written $ 2,323,626 $ 2,400,136 $ 9,900,309 $ 9,816,315
Net premiums written 2,057,802 2,162,504 8,271,601 8,200,588
Net premiums earned 2,433,805 2,582,969 7,566,740 7,568,194
Net claims and claim expenses incurred 878,820 1,373,614 4,664,701 3,849,239
Acquisition expenses 659,723 690,338 1,949,763 1,965,697
Operational expenses 125,073 125,261 350,996 339,484
Underwriting income (loss) 770,189 393,756 601,280 1,413,774
Net investment income 438,354 423,859 1,256,815 1,225,479
Net foreign exchange gains (losses) 877 16,804 2,209 (27,694)
Equity in earnings (losses) of other ventures 12,551 5,718 50,712 32,435
Other income (loss) 705 680 4,243 799
Net realized and unrealized gains (losses) on investments 311,890 943,745 994,550 602,507
Corporate expenses (23,414) (26,078) (70,005) (100,489)
Interest expense (30,582) (23,809) (89,461) (70,522)
Income (loss) before taxes 1,480,570 1,734,675 2,750,343 3,076,289
Income tax benefit (expense) (148,860) (102,012) (280,204) (96,536)
Net (income) loss attributable to redeemable noncontrolling interests (415,200) (450,176) (548,287) (919,734)
Dividends on preference shares (8,843) (8,843) (26,531) (26,531)
Net income (loss) available (attributable) to RenaissanceRe common shareholders 907,667 1,173,644 1,895,321 2,033,488
Net claims and claim expenses incurred – current accident year 1,258,871 1,666,120 5,510,336 4,347,097
Net claims and claim expenses incurred – prior accident years (380,051) (292,506) (845,635) (497,858)
Total net incurred $ 878,820 $ 1,373,614 $ 4,664,701 $ 3,849,239
Net claims and claim expense ratio – current accident year 51.70% 64.50% 72.80% 57.40%
Net claims and claim expense ratio – prior accident years (15.60%) (11.30%) (11.20%) (6.50%)
Net claims and claim expense ratio – calendar year 36.10% 53.20% 61.60% 50.90%
Underwriting expense ratio 32.30% 31.60% 30.50% 30.40%
Combined ratio 68.40% 84.80% 92.10% 81.30%
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 438,354 423,859 1,256,815 1,225,479
Net foreign exchange gains (losses) 877 16,804 2,209 (27,694)
Equity in earnings (losses) of other ventures 12,551 5,718 50,712 32,435
Other income (loss) 705 680 4,243 799
Net realized and unrealized gains (losses) on investments 311,890 943,745 994,550 602,507
Corporate expenses (23,414) (26,078) (70,005) (100,489)
Interest expense (30,582) (23,809) (89,461) (70,522)
Income tax benefit (expense) (148,860) (102,012) (280,204) (96,536)
Net (income) loss attributable to redeemable noncontrolling interests (415,200) (450,176) (548,287) (919,734)
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     (837,307) (470,801)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 733,274 790,709 4,596,042 4,433,688
Net premiums written 694,125 701,222 3,710,676 3,457,500
Net premiums earned 936,933 994,777 3,052,893 2,911,694
Net claims and claim expenses incurred (133,504) 329,967 1,481,823 757,570
Acquisition expenses 192,347 192,439 534,192 566,566
Operational expenses 86,579 77,688 222,414 206,737
Underwriting income (loss) 791,511 394,683 814,464 1,380,821
Net claims and claim expenses incurred – current accident year 250,169 621,710 2,319,130 1,228,371
Net claims and claim expenses incurred – prior accident years (383,673) (291,743) (837,307) (470,801)
Total net incurred $ (133,504) $ 329,967 $ 1,481,823 $ 757,570
Net claims and claim expense ratio – current accident year 26.70% 62.50% 76.00% 42.20%
Net claims and claim expense ratio – prior accident years (40.90%) (29.30%) (27.50%) (16.20%)
Net claims and claim expense ratio – calendar year (14.20%) 33.20% 48.50% 26.00%
Underwriting expense ratio 29.70% 27.10% 24.80% 26.60%
Combined ratio 15.50% 60.30% 73.30% 52.60%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (8,328) $ (27,057)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 1,590,352 $ 1,609,427 5,304,267 5,382,627
Net premiums written 1,363,677 1,461,282 4,560,925 4,743,088
Net premiums earned 1,496,872 1,588,192 4,513,847 4,656,500
Net claims and claim expenses incurred 1,012,324 1,043,647 3,182,878 3,091,669
Acquisition expenses 467,376 497,899 1,415,571 1,399,131
Operational expenses 38,494 47,573 128,582 132,747
Underwriting income (loss) (21,322) (927) (213,184) 32,953
Net claims and claim expenses incurred – current accident year 1,008,702 1,044,410 3,191,206 3,118,726
Net claims and claim expenses incurred – prior accident years 3,622 (763) (8,328) (27,057)
Total net incurred $ 1,012,324 $ 1,043,647 $ 3,182,878 $ 3,091,669
Net claims and claim expense ratio – current accident year 67.40% 65.80% 70.70% 67.00%
Net claims and claim expense ratio – prior accident years 0.20% (0.10%) (0.20%) (0.60%)
Net claims and claim expense ratio – calendar year 67.60% 65.70% 70.50% 66.40%
Underwriting expense ratio 33.80% 34.40% 34.20% 32.90%
Combined ratio 101.40% 100.10% 104.70% 99.30%