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Segment Reporting - Schedule of Significant Components of the Company's Revenues and Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Gross premiums written (Note 7) | $ 8,862,366 | $ 9,213,540 | $ 7,833,798
Net premiums written | 7,467,813 | 7,196,160 | 5,939,375
Net premiums earned | 7,471,133 | 6,333,989 | 5,194,181
Net claims and claim expenses incurred | 3,573,509 | 4,338,840 | 3,876,087
Acquisition expenses | 1,875,034 | 1,568,606 | 1,214,858
Operational expenses | 375,182 | 276,691 | 212,184
Underwriting income (loss) | 1,647,408 | 149,852 | (108,948)
Net investment income | 1,253,110 | 559,932 | 319,479
Net foreign exchange gains (losses) | (41,479) | (56,909) | (41,006)
Equity in earnings of other ventures | 43,474 | 11,249 | 12,309
Other income (loss) | (6,152) | 12,636 | 10,880
Net realized and unrealized gains (losses) on investments | 414,522 | (1,800,485) | (218,134)
Corporate expenses | (127,642) | (46,775) | (41,152)
Interest expense | (73,181) | (48,335) | (47,536)
Income (loss) before taxes | 3,110,060 | (1,218,835) | (114,108)
Income tax benefit (expense) | 510,067 | 59,019 | 10,668
Net (income) loss attributable to redeemable noncontrolling interests | (1,058,995) | 98,613 | 63,285
Dividends on preference shares | (35,375) | (35,375) | (33,266)
Net income (loss) available (attributable) to RenaissanceRe common shareholders | 2,525,757 | (1,096,578) | (73,421)
Net claims and claim expenses incurred – current accident year | 4,024,116 | 4,586,422 | 4,125,557
Net claims and claim expenses incurred – prior accident years | (450,607) | (247,582) | (249,470)
Total net incurred | $ 3,573,509 | $ 4,338,840 | $ 3,876,087
Net claims and claim expense ratio – current accident year | 53.90% | 72.40% | 79.40%
Net claims and claim expense ratio – prior accident years | (6.10%) | (3.90%) | (4.80%)
Net claims and claim expense ratio – calendar year | 47.80% | 68.50% | 74.60%
Underwriting expense ratio | 30.10% | 29.20% | 27.50%
Combined ratio | 77.90% | 97.70% | 102.10%
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross premiums written (Note 7) | $ 0 | $ 0 | $ 0
Net premiums written | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0
Net claims and claim expenses incurred | 0 | 0 | 0
Acquisition expenses | 0 | 0 | 0
Operational expenses | 0 | 0 | 0
Underwriting income (loss) | 0 | 0 | 0
Net investment income | 1,253,110 | 559,932 | 319,479
Net foreign exchange gains (losses) | (41,479) | (56,909) | (41,006)
Equity in earnings of other ventures | 43,474 | 11,249 | 12,309
Other income (loss) | (6,152) | 12,636 | 10,880
Net realized and unrealized gains (losses) on investments | 414,522 | (1,800,485) | (218,134)
Corporate expenses | (127,642) | (46,775) | (41,152)
Interest expense | (73,181) | (48,335) | (47,536)
Income tax benefit (expense) | 510,067 | 59,019 | 10,668
Net (income) loss attributable to redeemable noncontrolling interests | (1,058,995) | 98,613 | 63,285
Dividends on preference shares | (35,375) | (35,375) | (33,266)
Net claims and claim expenses incurred – current accident year | 0 | 0 | 0
Net claims and claim expenses incurred – prior accident years | 0 | 0 | 0
Total net incurred | 0 | 0 | 0
Property |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross premiums written (Note 7) | 3,562,414 | 3,734,241 | 3,958,724
Net claims and claim expenses incurred – prior accident years | (408,905) | (205,741) | (233,373)
Property | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross premiums written (Note 7) | 3,562,414 | 3,734,241 | 3,958,724
Net premiums written | 2,967,309 | 2,847,659 | 2,868,002
Net premiums earned | 3,090,792 | 2,770,227 | 2,608,298
Net claims and claim expenses incurred | 799,905 | 2,044,771 | 2,163,016
Acquisition expenses | 600,127 | 547,210 | 487,178
Operational expenses | 251,433 | 194,355 | 143,608
Underwriting income (loss) | 1,439,327 | (16,109) | (185,504)
Net claims and claim expenses incurred – current accident year | 1,208,810 | 2,250,512 | 2,396,389
Net claims and claim expenses incurred – prior accident years | (408,905) | (205,741) | (233,373)
Total net incurred | $ 799,905 | $ 2,044,771 | $ 2,163,016
Net claims and claim expense ratio – current accident year | 39.10% | 81.20% | 91.90%
Net claims and claim expense ratio – prior accident years | (13.20%) | (7.40%) | (9.00%)
Net claims and claim expense ratio – calendar year | 25.90% | 73.80% | 82.90%
Underwriting expense ratio | 27.50% | 26.80% | 24.20%
Combined ratio | 53.40% | 100.60% | 107.10%
Casualty and Specialty |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross premiums written (Note 7) | $ 5,299,952 | $ 5,479,299 | $ 3,875,074
Net claims and claim expenses incurred – prior accident years | (41,702) | (41,841) | (16,097)
Casualty and Specialty | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross premiums written (Note 7) | 5,299,952 | 5,479,299 | 3,875,074
Net premiums written | 4,500,504 | 4,348,501 | 3,071,373
Net premiums earned | 4,380,341 | 3,563,762 | 2,585,883
Net claims and claim expenses incurred | 2,773,604 | 2,294,069 | 1,713,071
Acquisition expenses | 1,274,907 | 1,021,396 | 727,680
Operational expenses | 123,749 | 82,336 | 68,576
Underwriting income (loss) | 208,081 | 165,961 | 76,556
Net claims and claim expenses incurred – current accident year | 2,815,306 | 2,335,910 | 1,729,168
Net claims and claim expenses incurred – prior accident years | (41,702) | (41,841) | (16,097)
Total net incurred | $ 2,773,604 | $ 2,294,069 | $ 1,713,071
Net claims and claim expense ratio – current accident year | 64.30% | 65.50% | 66.90%
Net claims and claim expense ratio – prior accident years | (1.00%) | (1.10%) | (0.70%)
Net claims and claim expense ratio – calendar year | 63.30% | 64.40% | 66.20%
Underwriting expense ratio | 31.90% | 30.90% | 30.80%
Combined ratio | 95.20% | 95.30% | 97.00%

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