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Segment Reporting (Schedule of Significant Components of the Company's Revenues and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) | $ 935,514 | $ 1,143,058 | $ 1,701,872 | $ 2,025,721 | $ 905,479 | $ 861,068 | $ 1,476,908 | $ 1,564,295 | $ 5,806,165 | $ 4,807,750 | $ 3,310,427
Net premiums written | 746,311 | 899,411 | 1,180,803 | 1,269,808 | 725,367 | 704,130 | 1,022,965 | 929,031 | 4,096,333 | 3,381,493 | 2,131,902
Net premiums earned | 1,029,085 | 1,000,183 | 1,010,096 | 913,098 | 970,125 | 906,748 | 911,502 | 550,028 | 3,952,462 | 3,338,403 | 1,976,129
Net claims and claim expenses incurred | 901,353 | 942,030 | 510,272 | 570,954 | 762,093 | 654,520 | 453,373 | 227,035 | 2,924,609 | 2,097,021 | 1,120,018
Acquisition expenses | 238,283 | 215,180 | 233,610 | 210,604 | 208,618 | 202,181 | 227,482 | 123,951 | 897,677 | 762,232 | 432,989
Operational expenses | 41,104 | 49,045 | 49,077 | 67,461 | 64,571 | 53,415 | 59,814 | 44,933 | 206,687 | 222,733 | 178,267
Underwriting income (loss) |  |  |  |  |  |  |  |  | (76,511) | 256,417 | 244,855
Net investment income | 81,717 | 83,543 | 89,305 | 99,473 | 112,138 | 111,388 | 118,587 | 82,094 | 354,038 | 424,207 | 269,965
Net foreign exchange gains (losses) | 23,270 | 17,426 | (7,195) | (5,728) | (1,126) | (8,275) | 9,309 | (2,846) | 27,773 | (2,938) | (12,428)
Equity in earnings (losses) of other ventures | (1,868) | 5,457 | 9,041 | 4,564 | 5,874 | 5,877 | 6,812 | 4,661 | 17,194 | 23,224 | 18,474
Other income | 4,374 | 1,476 | (1,201) | (4,436) | (160) | 1,016 | 922 | 3,171 | 213 | 4,949 | 5,969
Net realized and unrealized (losses) gains on investments | 258,745 | 224,208 | 448,390 | (110,707) | 18,454 | 34,394 | 191,248 | 170,013 | 820,636 | 414,109 | (183,168)
Corporate expenses | (21,031) | (48,050) | (11,898) | (15,991) | (17,642) | (13,844) | (23,847) | (38,789) | (96,970) | (94,122) | (33,983)
Interest expense | (11,841) | (11,843) | (11,842) | (14,927) | (15,496) | (15,580) | (15,534) | (11,754) | (50,453) | (58,364) | (47,069)
Income (loss) before taxes | 181,711 | 66,145 | 731,737 | 16,327 | 36,885 | 111,608 | 458,330 | 360,659 | 995,920 | 967,482 | 262,615
Income tax benefit (expense) | 9,923 | 8,244 | (29,875) | 8,846 | 3,455 | (3,664) | (9,475) | (7,531) | (2,862) | (17,215) | 6,302
Net income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (230,653) | (201,469) | (41,553)
Dividends on preference shares (Note 12) | (7,289) | (7,289) | (7,289) | (9,056) | (9,189) | (9,189) | (9,189) | (9,189) | (30,923) | (36,756) | (30,088)
Net income available to RenaissanceRe common shareholders | $ 189,812 | $ 47,799 | $ 575,845 | $ (81,974) | $ 33,773 | $ 36,698 | $ 367,854 | $ 273,717 | 731,482 | 712,042 | 197,276
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 3,108,421 | 2,123,876 | 1,390,767
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (183,812) | (26,855) | (270,749)
Total net incurred |  |  |  |  |  |  |  |  | $ 2,924,609 | $ 2,097,021 | $ 1,120,018
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 78.60% | 63.60% | 70.40%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (4.60%) | (0.80%) | (13.70%)
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 74.00% | 62.80% | 56.70%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 27.90% | 29.50% | 30.90%
Combined ratio |  |  |  |  |  |  |  |  | 101.90% | 92.30% | 87.60%
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 |  |  |  |  |  |  |  |  | 212 | (40) | (197)
Acquisition expenses |  |  |  |  |  |  |  |  | 0 | (207) | (2)
Operational expenses |  |  |  |  |  |  |  |  | 0 | (828) | 430
Underwriting income (loss) |  |  |  |  |  |  |  |  | (212) | 1,075 | (231)
Net investment income |  |  |  |  |  |  |  |  | 354,038 | 424,207 | 269,965
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  | 27,773 | (2,938) | (12,428)
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | 17,194 | 23,224 | 18,474
Other income |  |  |  |  |  |  |  |  | 213 | 4,949 | 5,969
Net realized and unrealized (losses) gains on investments |  |  |  |  |  |  |  |  | 820,636 | 414,109 | (183,168)
Corporate expenses |  |  |  |  |  |  |  |  | (96,970) | (94,122) | (33,983)
Interest expense |  |  |  |  |  |  |  |  | (50,453) | (58,364) | (47,069)
Income tax benefit (expense) |  |  |  |  |  |  |  |  | (2,862) | (17,215) | 6,302
Net income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (230,653) | (201,469) | (41,553)
Dividends on preference shares (Note 12) |  |  |  |  |  |  |  |  | (30,923) | (36,756) | (30,088)
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | 212 | (40) | (197)
Total net incurred |  |  |  |  |  |  |  |  | 212 | (40) | (197)
Property |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 2,999,142 | 2,430,985 | 1,760,926
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (157,261) | (2,933) | (221,290)
Property | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 2,999,142 | 2,430,985 | 1,760,926
Net premiums written |  |  |  |  |  |  |  |  | 2,037,200 | 1,654,259 | 1,055,188
Net premiums earned |  |  |  |  |  |  |  |  | 1,936,215 | 1,627,494 | 1,050,831
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 1,435,735 | 965,424 | 497,895
Acquisition expenses |  |  |  |  |  |  |  |  | 353,700 | 313,761 | 177,912
Operational expenses |  |  |  |  |  |  |  |  | 135,547 | 139,015 | 112,954
Underwriting income (loss) |  |  |  |  |  |  |  |  | 11,233 | 209,294 | 262,070
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 1,592,996 | 968,357 | 719,185
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (157,261) | (2,933) | (221,290)
Total net incurred |  |  |  |  |  |  |  |  | $ 1,435,735 | $ 965,424 | $ 497,895
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 82.30% | 59.50% | 68.40%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (8.10%) | (0.20%) | (21.00%)
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 74.20% | 59.30% | 47.40%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 25.20% | 27.80% | 27.70%
Combined ratio |  |  |  |  |  |  |  |  | 99.40% | 87.10% | 75.10%
Casualty and Specialty |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | $ 2,807,023 | $ 2,376,765 | $ 1,549,501
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (26,763) | (23,882) | (49,262)
Casualty and Specialty | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 2,807,023 | 2,376,765 | 1,549,501
Net premiums written |  |  |  |  |  |  |  |  | 2,059,133 | 1,727,234 | 1,076,714
Net premiums earned |  |  |  |  |  |  |  |  | 2,016,247 | 1,710,909 | 925,298
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 1,488,662 | 1,131,637 | 622,320
Acquisition expenses |  |  |  |  |  |  |  |  | 543,977 | 448,678 | 255,079
Operational expenses |  |  |  |  |  |  |  |  | 71,140 | 84,546 | 64,883
Underwriting income (loss) |  |  |  |  |  |  |  |  | (87,532) | 46,048 | (16,984)
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 1,515,425 | 1,155,519 | 671,582
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (26,763) | (23,882) | (49,262)
Total net incurred |  |  |  |  |  |  |  |  | $ 1,488,662 | $ 1,131,637 | $ 622,320
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 75.20% | 67.50% | 72.60%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (1.40%) | (1.40%) | (5.30%)
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 73.80% | 66.10% | 67.30%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 30.50% | 31.20% | 34.50%
Combined ratio |  |  |  |  |  |  |  |  | 104.30% | 97.30% | 101.80%

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