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Segment Reporting (Schedule of Significant Components of the Company's Revenues and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Gross premiums written $ 1,774,180 $ 1,143,058 $ 6,520,780 $ 4,870,651
Net premiums written 1,486,440 899,411 4,822,815 3,350,022
Net premiums earned 1,506,265 1,000,183 3,852,891 2,923,377
Net claims and claim expenses incurred 1,798,045 942,030 3,185,117 2,023,256
Acquisition expenses 328,048 215,180 880,872 659,394
Operational expenses 58,997 49,045 172,511 165,583
Underwriting (loss) income (678,825) (206,072) (385,609) 75,144
Net investment income 78,267 83,543 238,996 272,321
Net foreign exchange (losses) gains (4,755) 17,426 (24,309) 4,503
Equity in earnings of other ventures 5,305 5,457 8,479 19,062
Other income (loss) 1,692 1,476 4,449 (4,161)
Net realized and unrealized (losses) gains on investments (42,071) 224,208 (196,616) 561,891
Corporate expenses (10,196) (48,050) (30,726) (75,939)
Interest expense (11,919) (11,843) (35,664) (38,612)
(Loss) income before taxes (662,502) 66,145 (421,000) 814,209
Income tax benefit (expense) 23,630 8,244 29,284 (12,785)
Net loss (income) attributable to redeemable noncontrolling interests 198,495 (19,301) 131,801 (236,120)
Dividends on preference shares (9,845) (7,289) (24,423) (23,634)
Net (loss) income (attributable) available to RenaissanceRe common shareholders (450,222) 47,799 (284,338) 541,670
Net claims and claim expenses incurred – current accident year 1,945,695 995,907 3,393,828 2,078,639
Net claims and claim expenses incurred – prior accident years (147,650) (53,877) (208,711) (55,383)
Total net incurred $ 1,798,045 $ 942,030 $ 3,185,117 $ 2,023,256
Net claims and claim expense ratio – current accident year 129.20% 99.60% 88.10% 71.10%
Net claims and claim expense ratio – prior accident years (9.80%) (5.40%) (5.40%) (1.90%)
Net claims and claim expense ratio – calendar year 119.40% 94.20% 82.70% 69.20%
Underwriting expense ratio 25.70% 26.40% 27.30% 28.20%
Combined ratio 145.10% 120.60% 110.00% 97.40%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ 0 $ 0
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Net claims and claim expenses incurred 0 0 0 0
Acquisition expenses 0 0 0 0
Operational expenses 0 0 0 0
Underwriting (loss) income 0 0 0 0
Net investment income 78,267 83,543 238,996 272,321
Net foreign exchange (losses) gains (4,755) 17,426 (24,309) 4,503
Equity in earnings of other ventures 5,305 5,457 8,479 19,062
Other income (loss) 1,692 1,476 4,449 (4,161)
Net realized and unrealized (losses) gains on investments (42,071) 224,208 (196,616) 561,891
Corporate expenses (10,196) (48,050) (30,726) (75,939)
Interest expense (11,919) (11,843) (35,664) (38,612)
Income tax benefit (expense) 23,630 8,244 29,284 (12,785)
Net loss (income) attributable to redeemable noncontrolling interests 198,495 (19,301) 131,801 (236,120)
Dividends on preference shares (9,845) (7,289) (24,423) (23,634)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years 0 0 0 0
Total net incurred 0 0 0 0
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     (202,080) (31,556)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 773,692 427,765 3,574,067 2,690,827
Net premiums written 681,095 378,708 2,492,890 1,757,427
Net premiums earned 816,376 516,623 1,981,939 1,429,074
Net claims and claim expenses incurred 1,323,678 590,978 1,919,660 899,729
Acquisition expenses 134,179 98,545 356,171 278,668
Operational expenses 40,448 33,725 114,710 109,388
Underwriting (loss) income (681,929) (206,625) (408,602) 141,289
Net claims and claim expenses incurred – current accident year 1,469,613 629,827 2,121,740 931,285
Net claims and claim expenses incurred – prior accident years (145,935) (38,849) (202,080) (31,556)
Total net incurred $ 1,323,678 $ 590,978 $ 1,919,660 $ 899,729
Net claims and claim expense ratio – current accident year 180.00% 121.90% 107.10% 65.20%
Net claims and claim expense ratio – prior accident years (17.90%) (7.50%) (10.20%) (2.20%)
Net claims and claim expense ratio – calendar year 162.10% 114.40% 96.90% 63.00%
Underwriting expense ratio 21.40% 25.60% 23.70% 27.10%
Combined ratio 183.50% 140.00% 120.60% 90.10%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (6,631) $ (23,827)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 1,000,488 $ 715,293 2,946,713 2,179,824
Net premiums written 805,345 520,703 2,329,925 1,592,595
Net premiums earned 689,889 483,560 1,870,952 1,494,303
Net claims and claim expenses incurred 474,367 351,052 1,265,457 1,123,527
Acquisition expenses 193,869 116,636 524,701 380,726
Operational expenses 18,549 15,319 57,801 56,195
Underwriting (loss) income 3,104 553 22,993 (66,145)
Net claims and claim expenses incurred – current accident year 476,082 366,080 1,272,088 1,147,354
Net claims and claim expenses incurred – prior accident years (1,715) (15,028) (6,631) (23,827)
Total net incurred $ 474,367 $ 351,052 $ 1,265,457 $ 1,123,527
Net claims and claim expense ratio – current accident year 69.00% 75.70% 68.00% 76.80%
Net claims and claim expense ratio – prior accident years (0.20%) (3.10%) (0.40%) (1.60%)
Net claims and claim expense ratio – calendar year 68.80% 72.60% 67.60% 75.20%
Underwriting expense ratio 30.80% 27.30% 31.20% 29.20%
Combined ratio 99.60% 99.90% 98.80% 104.40%