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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Gross premiums written $ 4,155,503 $ 3,990,684
Net premiums written 3,443,529 3,199,573
Net premiums earned 2,720,781 2,443,910
Net claims and claim expenses incurred 2,743,758 1,166,123
Acquisition expenses 647,435 630,921
Operational expenses 100,185 106,184
Underwriting income (loss) (770,597) 540,682
Net investment income 405,353 390,775
Net foreign exchange gains (losses) (7,328) (35,683)
Equity in earnings (losses) of other ventures 17,828 14,127
Other income (loss) 914 (50)
Net realized and unrealized gains (losses) on investments 332,940 (213,654)
Corporate expenses (22,810) (39,252)
Interest expense (27,086) (23,104)
Income (loss) before taxes (70,786) 633,841
Income tax benefit (expense) 45,525 (15,372)
Net (income) loss attributable to redeemable noncontrolling interests 195,252 (244,827)
Dividends on preference shares (8,844) (8,844)
Net income (loss) available (attributable) to RenaissanceRe common shareholders 161,147 364,798
Net claims and claim expenses incurred – current accident year 2,939,632 1,263,204
Net claims and claim expenses incurred – prior accident years (195,874) (97,081)
Total net incurred $ 2,743,758 $ 1,166,123
Net claims and claim expense ratio – current accident year 108.00% 51.70%
Net claims and claim expense ratio – prior accident years (7.20%) (4.00%)
Net claims and claim expense ratio – calendar year 100.80% 47.70%
Underwriting expense ratio 27.50% 30.20%
Combined ratio 128.30% 77.90%
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 405,353 390,775
Net foreign exchange gains (losses) (7,328) (35,683)
Equity in earnings (losses) of other ventures 17,828 14,127
Other income (loss) 914 (50)
Net realized and unrealized gains (losses) on investments 332,940 (213,654)
Corporate expenses (22,810) (39,252)
Interest expense (27,086) (23,104)
Income tax benefit (expense) 45,525 (15,372)
Net (income) loss attributable to redeemable noncontrolling interests 195,252 (244,827)
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 (187,058) (94,667)
Property | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written 2,130,833 1,889,881
Net premiums written 1,690,994 1,397,618
Net premiums earned 1,247,950 936,083
Net claims and claim expenses incurred 1,623,257 154,249
Acquisition expenses 167,645 185,782
Operational expenses 64,266 61,624
Underwriting income (loss) (607,218) 534,428
Net claims and claim expenses incurred – current accident year 1,810,315 248,916
Net claims and claim expenses incurred – prior accident years (187,058) (94,667)
Total net incurred $ 1,623,257 $ 154,249
Net claims and claim expense ratio – current accident year 145.10% 26.60%
Net claims and claim expense ratio – prior accident years (15.00%) (10.10%)
Net claims and claim expense ratio – calendar year 130.10% 16.50%
Underwriting expense ratio 18.60% 26.40%
Combined ratio 148.70% 42.90%
Casualty and Specialty    
Segment Reporting Information [Line Items]    
Net claims and claim expenses incurred – prior accident years $ (8,816) $ (2,414)
Casualty and Specialty | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written 2,024,670 2,100,803
Net premiums written 1,752,535 1,801,955
Net premiums earned 1,472,831 1,507,827
Net claims and claim expenses incurred 1,120,501 1,011,874
Acquisition expenses 479,790 445,139
Operational expenses 35,919 44,560
Underwriting income (loss) (163,379) 6,254
Net claims and claim expenses incurred – current accident year 1,129,317 1,014,288
Net claims and claim expenses incurred – prior accident years (8,816) (2,414)
Total net incurred $ 1,120,501 $ 1,011,874
Net claims and claim expense ratio – current accident year 76.70% 67.30%
Net claims and claim expense ratio – prior accident years (0.60%) (0.20%)
Net claims and claim expense ratio – calendar year 76.10% 67.10%
Underwriting expense ratio 35.00% 32.50%
Combined ratio 111.10% 99.60%