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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Gross premiums written $ 3,990,684 $ 2,790,261
Net premiums written 3,199,573 2,263,703
Net premiums earned 2,443,910 1,680,550
Net claims and claim expenses incurred 1,166,123 801,200
Acquisition expenses 630,921 432,257
Operational expenses 106,184 77,474
Underwriting income (loss) 540,682 369,619
Net investment income 390,775 254,378
Net foreign exchange gains (losses) (35,683) (14,503)
Equity in earnings of other ventures 14,127 9,530
Other income (loss) (50) (4,306)
Net realized and unrealized gains (losses) on investments (213,654) 279,451
Corporate expenses (39,252) (12,843)
Interest expense (23,104) (12,134)
Income (loss) before taxes 633,841 869,192
Income tax benefit (expense) (15,372) (28,902)
Net (income) loss attributable to redeemable noncontrolling interests (244,827) (267,384)
Dividends on preference shares (8,844) (8,844)
Net income (loss) available (attributable) to RenaissanceRe common shareholders 364,798 564,062
Net income (loss) available (attributable) to RenaissanceRe common shareholders, diluted 364,798 564,062
Net claims and claim expenses incurred – current accident year 1,263,204 905,952
Net claims and claim expenses incurred – prior accident years (97,081) (104,752)
Total net incurred $ 1,166,123 $ 801,200
Net claims and claim expense ratio – current accident year 51.70% 53.90%
Net claims and claim expense ratio – prior accident years (4.00%) (6.20%)
Net claims and claim expense ratio – calendar year 47.70% 47.70%
Underwriting expense ratio 30.20% 30.30%
Combined ratio 77.90% 78.00%
Other    
Segment Reporting Information [Line Items]    
Gross premiums written $ 0 $ 0
Net premiums written 0 0
Net premiums earned 0 0
Net claims and claim expenses incurred 0 0
Acquisition expenses 0 0
Operational expenses 0 0
Underwriting income (loss) 0 0
Net investment income 390,775 254,378
Net foreign exchange gains (losses) (35,683) (14,503)
Equity in earnings of other ventures 14,127 9,530
Other income (loss) (50) (4,306)
Net realized and unrealized gains (losses) on investments (213,654) 279,451
Corporate expenses (39,252) (12,843)
Interest expense (23,104) (12,134)
Income tax benefit (expense) (15,372) (28,902)
Net (income) loss attributable to redeemable noncontrolling interests (244,827) (267,384)
Dividends on preference shares (8,844) (8,844)
Net claims and claim expenses incurred – current accident year 0 0
Net claims and claim expenses incurred – prior accident years 0 0
Total net incurred 0 0
Property    
Segment Reporting Information [Line Items]    
Net claims and claim expenses incurred – prior accident years (94,667) (81,693)
Property | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written 1,889,881 1,304,199
Net premiums written 1,397,618 1,019,829
Net premiums earned 936,083 687,420
Net claims and claim expenses incurred 154,249 187,609
Acquisition expenses 185,782 145,319
Operational expenses 61,624 55,813
Underwriting income (loss) 534,428 298,679
Net claims and claim expenses incurred – current accident year 248,916 269,302
Net claims and claim expenses incurred – prior accident years (94,667) (81,693)
Total net incurred $ 154,249 $ 187,609
Net claims and claim expense ratio – current accident year 26.60% 39.20%
Net claims and claim expense ratio – prior accident years (10.10%) (11.90%)
Net claims and claim expense ratio – calendar year 16.50% 27.30%
Underwriting expense ratio 26.40% 29.30%
Combined ratio 42.90% 56.60%
Casualty and Specialty    
Segment Reporting Information [Line Items]    
Net claims and claim expenses incurred – prior accident years $ (2,414) $ (23,059)
Casualty and Specialty | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written 2,100,803 1,486,062
Net premiums written 1,801,955 1,243,874
Net premiums earned 1,507,827 993,130
Net claims and claim expenses incurred 1,011,874 613,591
Acquisition expenses 445,139 286,938
Operational expenses 44,560 21,661
Underwriting income (loss) 6,254 70,940
Net claims and claim expenses incurred – current accident year 1,014,288 636,650
Net claims and claim expenses incurred – prior accident years (2,414) (23,059)
Total net incurred $ 1,011,874 $ 613,591
Net claims and claim expense ratio – current accident year 67.30% 64.10%
Net claims and claim expense ratio – prior accident years (0.20%) (2.30%)
Net claims and claim expense ratio – calendar year 67.10% 61.80%
Underwriting expense ratio 32.50% 31.10%
Combined ratio 99.60% 92.90%