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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 905,479 | $ 861,068 | $ 1,476,908 | $ 1,564,295 | $ 547,755 | $ 625,677 | $ 977,343 | $ 1,159,652 | $ 4,807,750 | $ 3,310,427 | $ 2,797,540
Net premiums written | 725,367 | 704,130 | 1,022,965 | 929,031 | 411,094 | 453,255 | 604,509 | 663,044 | 3,381,493 | 2,131,902 | 1,871,325
Net premiums earned | 970,125 | 906,748 | 911,502 | 550,028 | 574,613 | 531,849 | 429,385 | 440,282 | 3,338,403 | 1,976,129 | 1,717,575
Net claims and claim expenses incurred | 762,093 | 654,520 | 453,373 | 227,035 | 477,638 | 410,510 | 60,167 | 171,703 | 2,097,021 | 1,120,018 | 1,861,428
Acquisition expenses | 208,618 | 202,181 | 227,482 | 123,951 | 120,465 | 109,761 | 105,052 | 97,711 | 762,232 | 432,989 | 346,892
Operational expenses | 64,571 | 53,415 | 59,814 | 44,933 | 58,859 | 40,593 | 37,543 | 41,272 | 222,733 | 178,267 | 160,778
Underwriting income (loss) |  |  |  |  |  |  |  |  | 256,417 | 244,855 | (651,523)
Net investment income | 112,695 | 113,844 | 115,832 | 81,462 | 53,338 | 80,696 | 71,356 | 56,476 | 423,833 | 261,866 | 222,209
Net foreign exchange (losses) gains | (1,126) | (8,275) | 9,309 | (2,846) | (932) | (4,566) | (10,687) | 3,757 | (2,938) | (12,428) | 10,628
Equity in earnings of other ventures | 5,874 | 5,877 | 6,812 | 4,661 | 4,143 | 7,648 | 5,826 | 857 | 23,224 | 18,474 | 8,030
Other income | (160) | 1,016 | 922 | 3,171 | 5,489 | 497 | 1,225 | (1,242) | 4,949 | 5,969 | 9,415
Net realized and unrealized gains (losses) on investments | 17,897 | 31,938 | 194,003 | 170,645 | (88,654) | 13,630 | (17,901) | (82,144) | 414,483 | (175,069) | 135,822
Corporate expenses | (17,642) | (13,844) | (23,847) | (38,789) | (12,108) | (6,841) | (8,301) | (6,733) | (94,122) | (33,983) | (18,572)
Interest expense | (15,496) | (15,580) | (15,534) | (11,754) | (11,765) | (11,769) | (11,768) | (11,767) | (58,364) | (47,069) | (44,193)
Income (loss) before taxes | 36,885 | 111,608 | 458,330 | 360,659 | (132,838) | 50,280 | 256,373 | 88,800 | 967,482 | 262,615 | (328,184)
Income tax (expense) benefit | 3,455 | (3,664) | (9,475) | (7,531) | 8,852 | (1,451) | (4,506) | 3,407 | (17,215) | 6,302 | (26,487)
Net (income) loss attributable to redeemable noncontrolling interests | 2,622 | (62,057) | (71,812) | (70,222) | 49,269 | (6,440) | (54,483) | (29,899) | (201,469) | (41,553) | 132,282
Dividends on preference shares | (9,189) | (9,189) | (9,189) | (9,189) | (9,189) | (9,708) | (5,596) | (5,595) | (36,756) | (30,088) | (22,381)
Net income (loss) available (attributable) to RenaissanceRe common shareholders | $ 33,773 | $ 36,698 | $ 367,854 | $ 273,717 | $ (83,906) | $ 32,681 | $ 191,788 | $ 56,713 | 712,042 | 197,276 | (244,770)
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 2,123,876 | 1,390,767 | 1,902,424
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (26,855) | (270,749) | (40,996)
Total net incurred |  |  |  |  |  |  |  |  | $ 2,097,021 | $ 1,120,018 | $ 1,861,428
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 63.60% | 70.40% | 110.80%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (0.80%) | (13.70%) | (2.40%)
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 62.80% | 56.70% | 108.40%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 29.50% | 30.90% | 29.50%
Combined ratio |  |  |  |  |  |  |  |  | 92.30% | 87.60% | 137.90%
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ (7)
Net premiums written |  |  |  |  |  |  |  |  | 0 | 0 | 4
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 0 | 4
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | (40) | (197) | (1,583)
Acquisition expenses |  |  |  |  |  |  |  |  | (207) | (2) | (1)
Operational expenses |  |  |  |  |  |  |  |  | (828) | 430 | 36
Underwriting income (loss) |  |  |  |  |  |  |  |  | 1,075 | (231) | 1,552
Net investment income |  |  |  |  |  |  |  |  | 423,833 | 261,866 | 222,209
Net foreign exchange (losses) gains |  |  |  |  |  |  |  |  | (2,938) | (12,428) | 10,628
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | 23,224 | 18,474 | 8,030
Other income |  |  |  |  |  |  |  |  | 4,949 | 5,969 | 9,415
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | 414,483 | (175,069) | 135,822
Corporate expenses |  |  |  |  |  |  |  |  | (94,122) | (33,983) | (18,572)
Interest expense |  |  |  |  |  |  |  |  | (58,364) | (47,069) | (44,193)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (17,215) | 6,302 | (26,487)
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (201,469) | (41,553) | 132,282
Dividends on preference shares |  |  |  |  |  |  |  |  | (36,756) | (30,088) | (22,381)
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (40) | (197) | (1,583)
Total net incurred |  |  |  |  |  |  |  |  | (40) | (197) | (1,583)
Property |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 2,430,985 | 1,760,926 | 1,440,437
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (2,933) | (221,290) | (45,596)
Property | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 2,430,985 | 1,760,926 | 1,440,437
Net premiums written |  |  |  |  |  |  |  |  | 1,654,259 | 1,055,188 | 978,014
Net premiums earned |  |  |  |  |  |  |  |  | 1,627,494 | 1,050,831 | 931,070
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 965,424 | 497,895 | 1,297,985
Acquisition expenses |  |  |  |  |  |  |  |  | 313,761 | 177,912 | 113,816
Operational expenses |  |  |  |  |  |  |  |  | 139,015 | 112,954 | 94,194
Underwriting income (loss) |  |  |  |  |  |  |  |  | 209,294 | 262,070 | (574,925)
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 968,357 | 719,185 | 1,343,581
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (2,933) | (221,290) | (45,596)
Total net incurred |  |  |  |  |  |  |  |  | $ 965,424 | $ 497,895 | $ 1,297,985
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 59.50% | 68.40% | 144.30%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (0.20%) | (21.00%) | (4.90%)
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 59.30% | 47.40% | 139.40%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 27.80% | 27.70% | 22.30%
Combined ratio |  |  |  |  |  |  |  |  | 87.10% | 75.10% | 161.70%
Casualty and Specialty |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 2,376,765 | $ 1,549,501 | $ 1,357,110
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (23,882) | (49,262) | 6,183
Casualty and Specialty | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 2,376,765 | 1,549,501 | 1,357,110
Net premiums written |  |  |  |  |  |  |  |  | 1,727,234 | 1,076,714 | 893,307
Net premiums earned |  |  |  |  |  |  |  |  | 1,710,909 | 925,298 | 786,501
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 1,131,637 | 622,320 | 565,026
Acquisition expenses |  |  |  |  |  |  |  |  | 448,678 | 255,079 | 233,077
Operational expenses |  |  |  |  |  |  |  |  | 84,546 | 64,883 | 66,548
Underwriting income (loss) |  |  |  |  |  |  |  |  | 46,048 | (16,984) | (78,150)
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 1,155,519 | 671,582 | 558,843
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (23,882) | (49,262) | 6,183
Total net incurred |  |  |  |  |  |  |  |  | $ 1,131,637 | $ 622,320 | $ 565,026
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 67.50% | 72.60% | 71.10%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (1.40%) | (5.30%) | 0.70%
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 66.10% | 67.30% | 71.80%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 31.20% | 34.50% | 38.10%
Combined ratio |  |  |  |  |  |  |  |  | 97.30% | 101.80% | 109.90%

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