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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Gross premiums written (Note 7) $ 7,833,798 $ 5,806,165 $ 4,807,750
Net premiums written 5,939,375 4,096,333 3,381,493
Net premiums earned 5,194,181 3,952,462 3,338,403
Net claims and claim expenses incurred 3,876,087 2,924,609 2,097,021
Acquisition expenses 1,214,858 897,677 762,232
Operational expenses 212,184 206,687 222,733
Underwriting income (loss) (108,948) (76,511) 256,417
Net investment income 319,479 354,038 424,207
Net foreign exchange gains (losses) (41,006) 27,773 (2,938)
Equity in earnings (losses) of other ventures 12,309 17,194 23,224
Other income 10,880 213 4,949
Net realized and unrealized gains (losses) on investments (218,134) 820,636 414,109
Corporate expenses (41,152) (96,970) (94,122)
Interest expense (47,536) (50,453) (58,364)
Income (loss) before taxes (114,108) 995,920 967,482
Income tax benefit (expense) 10,668 (2,862) (17,215)
Net (income) loss attributable to redeemable noncontrolling interests 63,285 (230,653) (201,469)
Dividends on preference shares (Note 12) (33,266) (30,923) (36,756)
Net income (loss) available (attributable) to RenaissanceRe common shareholders (73,421) 731,482 712,042
Net claims and claim expenses incurred – current accident year 4,125,557 3,108,421 2,123,876
Net claims and claim expenses incurred – prior accident years (249,470) (183,812) (26,855)
Total net incurred $ 3,876,087 $ 2,924,609 $ 2,097,021
Net claims and claim expense ratio – current accident year 79.40% 78.60% 63.60%
Net claims and claim expense ratio – prior accident years (4.80%) (4.60%) (0.80%)
Net claims and claim expense ratio – calendar year 74.60% 74.00% 62.80%
Underwriting expense ratio 27.50% 27.90% 29.50%
Combined ratio 102.10% 101.90% 92.30%
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 319,479 354,038 424,207
Net foreign exchange gains (losses) (41,006) 27,773 (2,938)
Equity in earnings (losses) of other ventures 12,309 17,194 23,224
Other income 10,880 213 4,949
Net realized and unrealized gains (losses) on investments (218,134) 820,636 414,109
Corporate expenses (41,152) (96,970) (94,122)
Interest expense (47,536) (50,453) (58,364)
Income tax benefit (expense) 10,668 (2,862) (17,215)
Net (income) loss attributable to redeemable noncontrolling interests 63,285 (230,653) (201,469)
Dividends on preference shares (Note 12) (33,266) (30,923) (36,756)
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) 3,958,724 2,999,142 2,430,985
Net claims and claim expenses incurred – prior accident years (233,373) (157,049) (2,973)
Property | Operating Segments      
Segment Reporting Information [Line Items]      
Gross premiums written (Note 7) 3,958,724 2,999,142 2,430,985
Net premiums written 2,868,002 2,037,200 1,654,259
Net premiums earned 2,608,298 1,936,215 1,627,494
Net claims and claim expenses incurred 2,163,016 1,435,947 965,384
Acquisition expenses 487,178 353,700 313,554
Operational expenses 143,608 135,547 138,187
Underwriting income (loss) (185,504) 11,021 210,369
Net claims and claim expenses incurred – current accident year 2,396,389 1,592,996 968,357
Net claims and claim expenses incurred – prior accident years (233,373) (157,049) (2,973)
Total net incurred $ 2,163,016 $ 1,435,947 $ 965,384
Net claims and claim expense ratio – current accident year 91.90% 82.30% 59.50%
Net claims and claim expense ratio – prior accident years (9.00%) (8.10%) (0.20%)
Net claims and claim expense ratio – calendar year 82.90% 74.20% 59.30%
Underwriting expense ratio 24.20% 25.20% 27.80%
Combined ratio 107.10% 99.40% 87.10%
Casualty and Specialty      
Segment Reporting Information [Line Items]      
Gross premiums written (Note 7) $ 3,875,074 $ 2,807,023 $ 2,376,765
Net claims and claim expenses incurred – prior accident years (16,097) (26,763) (23,882)
Casualty and Specialty | Operating Segments      
Segment Reporting Information [Line Items]      
Gross premiums written (Note 7) 3,875,074 2,807,023 2,376,765
Net premiums written 3,071,373 2,059,133 1,727,234
Net premiums earned 2,585,883 2,016,247 1,710,909
Net claims and claim expenses incurred 1,713,071 1,488,662 1,131,637
Acquisition expenses 727,680 543,977 448,678
Operational expenses 68,576 71,140 84,546
Underwriting income (loss) 76,556 (87,532) 46,048
Net claims and claim expenses incurred – current accident year 1,729,168 1,515,425 1,155,519
Net claims and claim expenses incurred – prior accident years (16,097) (26,763) (23,882)
Total net incurred $ 1,713,071 $ 1,488,662 $ 1,131,637
Net claims and claim expense ratio – current accident year 66.90% 75.20% 67.50%
Net claims and claim expense ratio – prior accident years (0.70%) (1.40%) (1.40%)
Net claims and claim expense ratio – calendar year 66.20% 73.80% 66.10%
Underwriting expense ratio 30.80% 30.50% 31.20%
Combined ratio 97.00% 104.30% 97.30%