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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Gross premiums written $ 1,701,872 $ 1,476,908 $ 3,727,593 $ 3,041,203
Net premiums written 1,180,803 1,022,965 2,450,611 1,951,996
Net premiums earned 1,010,096 911,502 1,923,194 1,461,530
Net claims and claim expenses incurred 510,272 453,373 1,081,226 680,408
Acquisition expenses 233,610 227,482 444,214 351,433
Operational expenses 49,077 59,814 116,538 104,747
Underwriting income (loss) 217,137 170,833 281,216 324,942
Net investment income 89,305 118,588 188,778 200,682
Net foreign exchange (losses) gains (7,195) 9,309 (12,923) 6,463
Equity in earnings of other ventures 9,041 6,812 13,605 11,473
Other loss (1,201) 922 (5,637) 4,093
Net realized and unrealized gains on investments 448,390 191,247 337,683 361,260
Corporate expenses (11,898) (23,847) (27,889) (62,636)
Interest expense (11,842) (15,534) (26,769) (27,288)
Income before taxes 731,737 458,330 748,064 818,989
Income tax expense (29,875) (9,475) (21,029) (17,006)
Net income attributable to redeemable noncontrolling interests (118,728) (71,812) (216,819) (142,034)
Dividends on preference shares (7,289) (9,189) (16,345) (18,378)
Net income available to RenaissanceRe common shareholders 575,845 367,854 493,871 641,571
Net claims and claim expenses incurred – current accident year 525,678 453,140 1,082,732 684,481
Net claims and claim expenses incurred – prior accident years (15,406) 233 (1,506) (4,073)
Total net incurred $ 510,272 $ 453,373 $ 1,081,226 $ 680,408
Net claims and claim expense ratio – current accident year 52.00% 49.70% 56.30% 46.80%
Net claims and claim expense ratio – prior accident years (1.50%) 0.00% (0.10%) (0.20%)
Net claims and claim expense ratio – calendar year 50.50% 49.70% 56.20% 46.60%
Underwriting expense ratio 28.00% 31.60% 29.20% 31.20%
Combined ratio 78.50% 81.30% 85.40% 77.80%
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 (44) (2) (151) 17
Acquisition expenses 1 (192) 1 (192)
Operational expenses (1) 34 (1) 34
Underwriting income (loss) 44 160 151 141
Net investment income 89,305 118,588 188,778 200,682
Net foreign exchange (losses) gains (7,195) 9,309 (12,923) 6,463
Equity in earnings of other ventures 9,041 6,812 13,605 11,473
Other loss (1,201) 922 (5,637) 4,093
Net realized and unrealized gains on investments 448,390 191,247 337,683 361,260
Corporate expenses (11,898) (23,847) (27,889) (62,636)
Interest expense (11,842) (15,534) (26,769) (27,288)
Income tax expense (29,875) (9,475) (21,029) (17,006)
Net income attributable to redeemable noncontrolling interests (118,728) (71,812) (216,819) (142,034)
Dividends on preference shares (7,289) (9,189) (16,345) (18,378)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years (44) (2) (151) 17
Total net incurred (44) (2) (151) 17
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     7,444 12,640
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 1,042,536 839,200 2,263,062 1,871,584
Net premiums written 704,138 544,115 1,378,719 1,108,345
Net premiums earned 491,116 425,013 912,451 715,758
Net claims and claim expenses incurred 164,050 146,874 308,902 202,957
Acquisition expenses 94,772 89,711 180,123 143,450
Operational expenses 31,656 36,764 75,663 65,308
Underwriting income (loss) 200,638 151,664 347,763 304,043
Net claims and claim expenses incurred – current accident year 170,614 136,111 301,458 190,317
Net claims and claim expenses incurred – prior accident years (6,564) 10,763 7,444 12,640
Total net incurred $ 164,050 $ 146,874 $ 308,902 $ 202,957
Net claims and claim expense ratio – current accident year 34.70% 32.00% 33.00% 26.60%
Net claims and claim expense ratio – prior accident years (1.30%) 2.60% 0.90% 1.80%
Net claims and claim expense ratio – calendar year 33.40% 34.60% 33.90% 28.40%
Underwriting expense ratio 25.70% 29.70% 28.00% 29.10%
Combined ratio 59.10% 64.30% 61.90% 57.50%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (8,799) $ (16,730)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 659,336 $ 637,708 1,464,531 1,169,619
Net premiums written 476,665 478,850 1,071,892 843,651
Net premiums earned 518,980 486,489 1,010,743 745,772
Net claims and claim expenses incurred 346,266 306,501 772,475 477,434
Acquisition expenses 138,837 137,963 264,090 208,175
Operational expenses 17,422 23,016 40,876 39,405
Underwriting income (loss) 16,455 19,009 (66,698) 20,758
Net claims and claim expenses incurred – current accident year 355,064 317,029 781,274 494,164
Net claims and claim expenses incurred – prior accident years (8,798) (10,528) (8,799) (16,730)
Total net incurred $ 346,266 $ 306,501 $ 772,475 $ 477,434
Net claims and claim expense ratio – current accident year 68.40% 65.20% 77.30% 66.30%
Net claims and claim expense ratio – prior accident years (1.70%) (2.20%) (0.90%) (2.30%)
Net claims and claim expense ratio – calendar year 66.70% 63.00% 76.40% 64.00%
Underwriting expense ratio 30.10% 33.10% 30.20% 33.20%
Combined ratio 96.80% 96.10% 106.60% 97.20%