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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Gross premiums written $ 977,343 $ 827,415 $ 2,136,995 $ 1,749,505
Net premiums written 604,509 555,745 1,267,553 1,099,881
Net premiums earned 429,385 382,265 869,667 748,310
Net claims and claim expenses incurred 60,167 142,587 231,870 335,668
Acquisition expenses 105,052 88,251 202,763 171,533
Operational expenses 37,543 41,766 78,815 89,049
Underwriting income (loss) 226,623 109,661 356,219 152,060
Net investment income 71,356 54,163 127,832 108,488
Net foreign exchange (losses) gains (10,687) 3,109 (6,930) 11,274
Equity in earnings (losses) of other ventures 5,826 5,543 6,683 4,036
Other income (loss) 1,225 2,392 (17) 4,057
Net realized and unrealized (losses) gains on investments (17,901) 58,113 (100,045) 101,486
Corporate expenses (8,301) (4,636) (15,034) (9,922)
Interest expense (11,768) (10,091) (23,535) (20,617)
Income before taxes 256,373 218,254 345,173 350,862
Income tax expense (4,506) (3,904) (1,099) (4,238)
Net (income) loss attributable to redeemable noncontrolling interests (54,483) (37,612) (84,382) (71,939)
Dividends on preference shares (5,596) (5,596) (11,191) (11,191)
Net income available to RenaissanceRe common shareholders 191,788 171,142 248,501 263,494
Net claims and claim expenses incurred – current accident year 216,396 187,691 419,434 351,766
Net claims and claim expenses incurred – prior accident years (156,229) (45,104) (187,564) (16,098)
Total net incurred $ 60,167 $ 142,587 $ 231,870 $ 335,668
Net claims and claim expense ratio – current accident year 50.40% 49.10% 48.20% 47.00%
Net claims and claim expense ratio – prior accident years (36.40%) (11.80%) (21.50%) (2.10%)
Net claims and claim expense ratio – calendar year 14.00% 37.30% 26.70% 44.90%
Underwriting expense ratio 33.20% 34.00% 32.30% 34.80%
Combined ratio 47.20% 71.30% 59.00% 79.70%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ 0 $ 0
Net premiums written 0 0 0 0
Net premiums earned 0 2 0 0
Net claims and claim expenses incurred (88) (227) (70) (555)
Acquisition expenses 1 (1) 1 (1)
Operational expenses 181 1 314 12
Underwriting income (loss) (94) 229 (245) 544
Net investment income 71,356 54,163 127,832 108,488
Net foreign exchange (losses) gains (10,687) 3,109 (6,930) 11,274
Equity in earnings (losses) of other ventures 5,826 5,543 6,683 4,036
Other income (loss) 1,225 2,392 (17) 4,057
Net realized and unrealized (losses) gains on investments (17,901) 58,113 (100,045) 101,486
Corporate expenses (8,301) (4,636) (15,034) (9,922)
Interest expense (11,768) (10,091) (23,535) (20,617)
Income tax expense (4,506) (3,904) (1,099) (4,238)
Net (income) loss attributable to redeemable noncontrolling interests (54,483) (37,612) (84,382) (71,939)
Dividends on preference shares (5,596) (5,596) (11,191) (11,191)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years (88) (227) (70) (555)
Total net incurred (88) (227) (70) (555)
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     (170,707) (24,800)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 552,627 499,347 1,259,595 1,019,876
Net premiums written 297,832 336,464 651,909 626,335
Net premiums earned 204,138 192,198 429,187 379,186
Net claims and claim expenses incurred (74,269) 33,017 (43,662) 71,855
Acquisition expenses 40,850 28,500 81,571 57,603
Operational expenses 23,810 24,053 50,356 51,718
Underwriting income (loss) 213,747 106,628 340,922 198,010
Net claims and claim expenses incurred – current accident year 68,876 56,889 127,045 96,655
Net claims and claim expenses incurred – prior accident years (143,145) (23,872) (170,707) (24,800)
Total net incurred $ (74,269) $ 33,017 $ (43,662) $ 71,855
Net claims and claim expense ratio – current accident year 33.70% 29.60% 29.60% 25.50%
Net claims and claim expense ratio – prior accident years (70.10%) (12.40%) (39.80%) (6.60%)
Net claims and claim expense ratio – calendar year (36.40%) 17.20% (10.20%) 18.90%
Underwriting expense ratio 31.70% 27.30% 30.80% 28.90%
Combined ratio (4.70%) 44.50% 20.60% 47.80%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (16,787) $ 9,257
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 424,716 $ 328,068 877,400 729,629
Net premiums written 306,677 219,281 615,644 473,546
Net premiums earned 225,247 190,065 440,480 369,124
Net claims and claim expenses incurred 134,524 109,797 275,602 264,368
Acquisition expenses 64,201 59,752 121,191 113,931
Operational expenses 13,552 17,712 28,145 37,319
Underwriting income (loss) 12,970 2,804 15,542 (46,494)
Net claims and claim expenses incurred – current accident year 147,520 130,802 292,389 255,111
Net claims and claim expenses incurred – prior accident years (12,996) (21,005) (16,787) 9,257
Total net incurred $ 134,524 $ 109,797 $ 275,602 $ 264,368
Net claims and claim expense ratio – current accident year 65.50% 68.80% 66.40% 69.10%
Net claims and claim expense ratio – prior accident years (5.80%) (11.00%) (3.80%) 2.50%
Net claims and claim expense ratio – calendar year 59.70% 57.80% 62.60% 71.60%
Underwriting expense ratio 34.50% 40.70% 33.90% 41.00%
Combined ratio 94.20% 98.50% 96.50% 112.60%