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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Gross premiums written $ 1,143,058 $ 861,068 $ 4,870,651 $ 3,902,271
Net premiums written 899,411 704,130 3,350,022 2,656,126
Net premiums earned 1,000,183 906,748 2,923,377 2,368,278
Net claims and claim expenses incurred 942,030 654,520 2,023,256 1,334,928
Acquisition expenses 215,180 202,181 659,394 553,614
Operational expenses 49,045 53,415 165,583 158,162
Underwriting income (loss) (206,072) (3,368) 75,144 321,574
Net investment income 83,543 111,387 272,321 312,069
Net foreign exchange gains (losses) 17,426 (8,275) 4,503 (1,812)
Equity in earnings of other ventures 5,457 5,877 19,062 17,350
Other income (loss) 1,476 1,016 (4,161) 5,109
Net realized and unrealized gains on investments 224,208 34,395 561,891 395,655
Corporate expenses (48,050) (13,844) (75,939) (76,480)
Interest expense (11,843) (15,580) (38,612) (42,868)
Income before taxes 66,145 111,608 814,209 930,597
Income tax benefit (expense) 8,244 (3,664) (12,785) (20,670)
Net income attributable to redeemable noncontrolling interests (19,301) (62,057) (236,120) (204,091)
Dividends on preference shares (7,289) (9,189) (23,634) (27,567)
Net income available to RenaissanceRe common shareholders 47,799 36,698 541,670 678,269
Net claims and claim expenses incurred – current accident year 995,907 664,967 2,078,639 1,349,448
Net claims and claim expenses incurred – prior accident years (53,877) (10,447) (55,383) (14,520)
Total net incurred $ 942,030 $ 654,520 $ 2,023,256 $ 1,334,928
Net claims and claim expense ratio – current accident year 99.60% 73.30% 71.10% 57.00%
Net claims and claim expense ratio – prior accident years (5.40%) (1.10%) (1.90%) (0.60%)
Net claims and claim expense ratio – calendar year 94.20% 72.20% 69.20% 56.40%
Underwriting expense ratio 26.40% 28.20% 28.20% 30.00%
Combined ratio 120.60% 100.40% 97.40% 86.40%
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 20 161 (131) 178
Acquisition expenses (1) 6 0 (186)
Operational expenses 54 (21) 53 13
Underwriting income (loss) (73) (146) 78 (5)
Net investment income 83,543 111,387 272,321 312,069
Net foreign exchange gains (losses) 17,426 (8,275) 4,503 (1,812)
Equity in earnings of other ventures 5,457 5,877 19,062 17,350
Other income (loss) 1,476 1,016 (4,161) 5,109
Net realized and unrealized gains on investments 224,208 34,395 561,891 395,655
Corporate expenses (48,050) (13,844) (75,939) (76,480)
Interest expense (11,843) (15,580) (38,612) (42,868)
Income tax benefit (expense) 8,244 (3,664) (12,785) (20,670)
Net income attributable to redeemable noncontrolling interests (19,301) (62,057) (236,120) (204,091)
Dividends on preference shares (7,289) (9,189) (23,634) (27,567)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years 20 161 (131) 178
Total net incurred 20 161 (131) 178
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     (31,425) 5,020
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 427,765 314,400 2,690,827 2,185,984
Net premiums written 378,708 302,982 1,757,427 1,411,327
Net premiums earned 516,623 444,332 1,429,074 1,160,090
Net claims and claim expenses incurred 590,958 338,260 899,860 541,217
Acquisition expenses 98,545 79,521 278,668 222,971
Operational expenses 33,672 34,238 109,335 99,546
Underwriting income (loss) (206,552) (7,687) 141,211 296,356
Net claims and claim expenses incurred – current accident year 629,827 345,880 931,285 536,197
Net claims and claim expenses incurred – prior accident years (38,869) (7,620) (31,425) 5,020
Total net incurred $ 590,958 $ 338,260 $ 899,860 $ 541,217
Net claims and claim expense ratio – current accident year 121.90% 77.80% 65.20% 46.20%
Net claims and claim expense ratio – prior accident years (7.50%) (1.70%) (2.20%) 0.50%
Net claims and claim expense ratio – calendar year 114.40% 76.10% 63.00% 46.70%
Underwriting expense ratio 25.60% 25.60% 27.10% 27.80%
Combined ratio 140.00% 101.70% 90.10% 74.50%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (23,827) $ (19,718)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 715,293 $ 546,668 2,179,824 1,716,287
Net premiums written 520,703 401,148 1,592,595 1,244,799
Net premiums earned 483,560 462,416 1,494,303 1,208,188
Net claims and claim expenses incurred 351,052 316,099 1,123,527 793,533
Acquisition expenses 116,636 122,654 380,726 330,829
Operational expenses 15,319 19,198 56,195 58,603
Underwriting income (loss) 553 4,465 (66,145) 25,223
Net claims and claim expenses incurred – current accident year 366,080 319,087 1,147,354 813,251
Net claims and claim expenses incurred – prior accident years (15,028) (2,988) (23,827) (19,718)
Total net incurred $ 351,052 $ 316,099 $ 1,123,527 $ 793,533
Net claims and claim expense ratio – current accident year 75.70% 69.00% 76.80% 67.30%
Net claims and claim expense ratio – prior accident years (3.10%) (0.60%) (1.60%) (1.60%)
Net claims and claim expense ratio – calendar year 72.60% 68.40% 75.20% 65.70%
Underwriting expense ratio 27.30% 30.60% 29.20% 32.20%
Combined ratio 99.90% 99.00% 104.40% 97.90%