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Segment Reporting (Schedule of Significant Components of the Company's Revenues and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Gross premiums written $ 2,094,158 $ 1,701,872 $ 4,746,600 $ 3,727,593
Net premiums written 1,512,292 1,180,803 3,336,375 2,450,611
Net premiums earned 1,192,790 1,010,096 2,346,626 1,923,194
Net claims and claim expenses incurred 520,021 510,272 1,387,072 1,081,226
Acquisition expenses 285,590 233,610 552,824 444,214
Operational expenses 58,203 49,077 113,514 116,538
Underwriting income 328,976 217,137 293,216 281,216
Net investment income 80,925 89,305 160,729 188,778
Net foreign exchange gains (losses) 3,234 (7,195) (19,554) (12,923)
Equity in earnings of other ventures 8,732 9,041 3,174 13,605
Other income (loss) 586 (1,201) 2,757 (5,637)
Net realized and unrealized gains (losses) on investments 191,018 448,390 (154,545) 337,683
Corporate expenses (10,125) (11,898) (20,530) (27,889)
Interest expense (11,833) (11,842) (23,745) (26,769)
Income before taxes 591,513 731,737 241,502 748,064
Income tax (expense) benefit (13,862) (29,875) 5,654 (21,029)
Net income attributable to redeemable noncontrolling interests (113,544) (118,728) (66,694) (216,819)
Dividends on preference shares (7,289) (7,289) (14,578) (16,345)
Net income available to RenaissanceRe common shareholders 456,818 575,845 165,884 493,871
Net claims and claim expenses incurred – current accident year 572,050 525,678 1,448,133 1,082,732
Net claims and claim expenses incurred – prior accident years (52,029) (15,406) (61,061) (1,506)
Total net incurred $ 520,021 $ 510,272 $ 1,387,072 $ 1,081,226
Net claims and claim expense ratio – current accident year 48.00% 52.00% 61.70% 56.30%
Net claims and claim expense ratio – prior accident years (4.40%) (1.50%) (2.60%) (0.10%)
Net claims and claim expense ratio – calendar year 43.60% 50.50% 59.10% 56.20%
Underwriting expense ratio 28.80% 28.00% 28.40% 29.20%
Combined ratio 72.40% 78.50% 87.50% 85.40%
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 income 0 0 0 0
Net investment income 80,925 89,305 160,729 188,778
Net foreign exchange gains (losses) 3,234 (7,195) (19,554) (12,923)
Equity in earnings of other ventures 8,732 9,041 3,174 13,605
Other income (loss) 586 (1,201) 2,757 (5,637)
Net realized and unrealized gains (losses) on investments 191,018 448,390 (154,545) 337,683
Corporate expenses (10,125) (11,898) (20,530) (27,889)
Interest expense (11,833) (11,842) (23,745) (26,769)
Income tax (expense) benefit (13,862) (29,875) 5,654 (21,029)
Net income attributable to redeemable noncontrolling interests (113,544) (118,728) (66,694) (216,819)
Dividends on preference shares (7,289) (7,289) (14,578) (16,345)
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     (56,145) 7,293
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 1,183,556 1,042,536 2,800,375 2,263,062
Net premiums written 803,335 704,138 1,811,795 1,378,719
Net premiums earned 560,397 491,116 1,165,563 912,451
Net claims and claim expenses incurred 97,150 164,006 595,982 308,751
Acquisition expenses 109,238 94,773 221,992 180,124
Operational expenses 38,887 31,655 74,262 75,662
Underwriting income 315,122 200,682 273,327 347,914
Net claims and claim expenses incurred – current accident year 148,133 170,614 652,127 301,458
Net claims and claim expenses incurred – prior accident years (50,983) (6,608) (56,145) 7,293
Total net incurred $ 97,150 $ 164,006 $ 595,982 $ 308,751
Net claims and claim expense ratio – current accident year 26.40% 34.70% 55.90% 33.00%
Net claims and claim expense ratio – prior accident years (9.10%) (1.30%) (4.80%) 0.80%
Net claims and claim expense ratio – calendar year 17.30% 33.40% 51.10% 33.80%
Underwriting expense ratio 26.50% 25.70% 25.40% 28.10%
Combined ratio 43.80% 59.10% 76.50% 61.90%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (4,916) $ (8,799)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 910,602 $ 659,336 1,946,225 1,464,531
Net premiums written 708,957 476,665 1,524,580 1,071,892
Net premiums earned 632,393 518,980 1,181,063 1,010,743
Net claims and claim expenses incurred 422,871 346,266 791,090 772,475
Acquisition expenses 176,352 138,837 330,832 264,090
Operational expenses 19,316 17,422 39,252 40,876
Underwriting income 13,854 16,455 19,889 (66,698)
Net claims and claim expenses incurred – current accident year 423,917 355,064 796,006 781,274
Net claims and claim expenses incurred – prior accident years (1,046) (8,798) (4,916) (8,799)
Total net incurred $ 422,871 $ 346,266 $ 791,090 $ 772,475
Net claims and claim expense ratio – current accident year 67.00% 68.40% 67.40% 77.30%
Net claims and claim expense ratio – prior accident years (0.10%) (1.70%) (0.40%) (0.90%)
Net claims and claim expense ratio – calendar year 66.90% 66.70% 67.00% 76.40%
Underwriting expense ratio 30.90% 30.10% 31.30% 30.20%
Combined ratio 97.80% 96.80% 98.30% 106.60%