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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting, Measurement Disclosures [Abstract] |
Schedule of Significant Components of the Company's Revenues and Expenses | A summary of the significant components of the Company’s revenues and expenses by segment is as follows:
| Year ended December 31, 2018 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 1,760,926 |  |  | $ | 1,549,501 |  |  | $ | — |  |  | $ | 3,310,427 |  |
| Net premiums written | $ | 1,055,188 |  |  | $ | 1,076,714 |  |  | $ | — |  |  | $ | 2,131,902 |  |
| Net premiums earned | $ | 1,050,831 |  |  | $ | 925,298 |  |  | $ | — |  |  | $ | 1,976,129 |  |
| Net claims and claim expenses incurred | 497,895 |  |  | 622,320 |  |  | (197 | ) |  | 1,120,018 |  |
| Acquisition expenses | 177,912 |  |  | 255,079 |  |  | (2 | ) |  | 432,989 |  |
| Operational expenses | 112,954 |  |  | 64,883 |  |  | 430 |  |  | 178,267 |  |
| Underwriting income (loss) | $ | 262,070 |  |  | $ | (16,984 | ) |  | $ | (231 | ) |  | 244,855 |  |
| Net investment income |  |  |  |  | 261,866 |  |  | 261,866 |  |
| Net foreign exchange losses |  |  |  |  | (12,428 | ) |  | (12,428 | ) |
| Equity in earnings of other ventures |  |  |  |  | 18,474 |  |  | 18,474 |  |
| Other income |  |  |  |  | 5,969 |  |  | 5,969 |  |
| Net realized and unrealized losses on investments |  |  |  |  | (175,069 | ) |  | (175,069 | ) |
| Corporate expenses |  |  |  |  | (33,983 | ) |  | (33,983 | ) |
| Interest expense |  |  |  |  | (47,069 | ) |  | (47,069 | ) |
| Income before taxes and redeemable noncontrolling interests |  |  |  |  |  |  | 262,615 |  |
| Income tax benefit |  |  |  |  | 6,302 |  |  | 6,302 |  |
| Net income attributable to redeemable noncontrolling interests |  |  |  |  | (41,553 | ) |  | (41,553 | ) |
| Dividends on preference shares |  |  |  |  | (30,088 | ) |  | (30,088 | ) |
| Net income available to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 197,276 |  |
| Net claims and claim expenses incurred – current accident year | $ | 719,185 |  |  | $ | 671,582 |  |  | $ | — |  |  | $ | 1,390,767 |  |
| Net claims and claim expenses incurred – prior accident years | (221,290 | ) |  | (49,262 | ) |  | (197 | ) |  | (270,749 | ) |
| Net claims and claim expenses incurred – total | $ | 497,895 |  |  | $ | 622,320 |  |  | $ | (197 | ) |  | $ | 1,120,018 |  |
| Net claims and claim expense ratio – current accident year | 68.4 | % |  | 72.6 | % |  |  |  | 70.4 | % |
| Net claims and claim expense ratio – prior accident years | (21.0 | )% |  | (5.3 | )% |  |  |  | (13.7 | )% |
| Net claims and claim expense ratio – calendar year | 47.4 | % |  | 67.3 | % |  |  |  | 56.7 | % |
| Underwriting expense ratio | 27.7 | % |  | 34.5 | % |  |  |  | 30.9 | % |
| Combined ratio | 75.1 | % |  | 101.8 | % |  |  |  | 87.6 | % |
| Year ended December 31, 2017 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 1,440,437 |  |  | $ | 1,357,110 |  |  | $ | (7 | ) |  | $ | 2,797,540 |  |
| Net premiums written | $ | 978,014 |  |  | $ | 893,307 |  |  | $ | 4 |  |  | $ | 1,871,325 |  |
| Net premiums earned | $ | 931,070 |  |  | $ | 786,501 |  |  | $ | 4 |  |  | $ | 1,717,575 |  |
| Net claims and claim expenses incurred | 1,297,985 |  |  | 565,026 |  |  | (1,583 | ) |  | 1,861,428 |  |
| Acquisition expenses | 113,816 |  |  | 233,077 |  |  | (1 | ) |  | 346,892 |  |
| Operational expenses | 94,194 |  |  | 66,548 |  |  | 36 |  |  | 160,778 |  |
| Underwriting (loss) income | $ | (574,925 | ) |  | $ | (78,150 | ) |  | $ | 1,552 |  |  | (651,523 | ) |
| Net investment income |  |  |  |  | 222,209 |  |  | 222,209 |  |
| Net foreign exchange gains |  |  |  |  | 10,628 |  |  | 10,628 |  |
| Equity in earnings of other ventures |  |  |  |  | 8,030 |  |  | 8,030 |  |
| Other income |  |  |  |  | 9,415 |  |  | 9,415 |  |
| Net realized and unrealized gains on investments |  |  |  |  | 135,822 |  |  | 135,822 |  |
| Corporate expenses |  |  |  |  | (18,572 | ) |  | (18,572 | ) |
| Interest expense |  |  |  |  | (44,193 | ) |  | (44,193 | ) |
| Loss before taxes and noncontrolling interests |  |  |  |  |  |  | (328,184 | ) |
| Income tax expense |  |  |  |  | (26,487 | ) |  | (26,487 | ) |
| Net loss attributable to noncontrolling interests |  |  |  |  | 132,282 |  |  | 132,282 |  |
| Dividends on preference shares |  |  |  |  | (22,381 | ) |  | (22,381 | ) |
| Net loss attributable to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | (244,770 | ) |
| Net claims and claim expenses incurred – current accident year | $ | 1,343,581 |  |  | $ | 558,843 |  |  | $ | — |  |  | $ | 1,902,424 |  |
| Net claims and claim expenses incurred – prior accident years | (45,596 | ) |  | 6,183 |  |  | (1,583 | ) |  | (40,996 | ) |
| Net claims and claim expenses incurred – total | $ | 1,297,985 |  |  | $ | 565,026 |  |  | $ | (1,583 | ) |  | $ | 1,861,428 |  |
| Net claims and claim expense ratio – current accident year | 144.3 | % |  | 71.1 | % |  |  |  | 110.8 | % |
| Net claims and claim expense ratio – prior accident years | (4.9 | )% |  | 0.7 | % |  |  |  | (2.4 | )% |
| Net claims and claim expense ratio – calendar year | 139.4 | % |  | 71.8 | % |  |  |  | 108.4 | % |
| Underwriting expense ratio | 22.3 | % |  | 38.1 | % |  |  |  | 29.5 | % |
| Combined ratio | 161.7 | % |  | 109.9 | % |  |  |  | 137.9 | % |
| Year ended December 31, 2016 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 1,111,263 |  |  | $ | 1,263,313 |  |  | $ | — |  |  | $ | 2,374,576 |  |
| Net premiums written | $ | 725,321 |  |  | $ | 809,848 |  |  | $ | 143 |  |  | $ | 1,535,312 |  |
| Net premiums earned | $ | 720,951 |  |  | $ | 682,337 |  |  | $ | 142 |  |  | $ | 1,403,430 |  |
| Net claims and claim expenses incurred | 151,545 |  |  | 380,396 |  |  | (1,110 | ) |  | 530,831 |  |
| Acquisition expenses | 97,594 |  |  | 191,729 |  |  | — |  |  | 289,323 |  |
| Operational expenses | 108,642 |  |  | 88,984 |  |  | 123 |  |  | 197,749 |  |
| Underwriting income | $ | 363,170 |  |  | $ | 21,228 |  |  | $ | 1,129 |  |  | 385,527 |  |
| Net investment income |  |  |  |  | 181,726 |  |  | 181,726 |  |
| Net foreign exchange losses |  |  |  |  | (13,788 | ) |  | (13,788 | ) |
| Equity in earnings of other ventures |  |  |  |  | 963 |  |  | 963 |  |
| Other income |  |  |  |  | 14,178 |  |  | 14,178 |  |
| Net realized and unrealized gains on investments |  |  |  |  | 141,328 |  |  | 141,328 |  |
| Corporate expenses |  |  |  |  | (37,402 | ) |  | (37,402 | ) |
| Interest expense |  |  |  |  | (42,144 | ) |  | (42,144 | ) |
| Income before taxes and noncontrolling interests |  |  |  |  |  |  | 630,388 |  |
| Income tax expense |  |  |  |  | (340 | ) |  | (340 | ) |
| Net income attributable to noncontrolling interests |  |  |  |  | (127,086 | ) |  | (127,086 | ) |
| Dividends on preference shares |  |  |  |  | (22,381 | ) |  | (22,381 | ) |
| Net income available to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 480,581 |  |
| Net claims and claim expenses incurred – current accident year | $ | 256,421 |  |  | $ | 438,536 |  |  | $ | — |  |  | $ | 694,957 |  |
| Net claims and claim expenses incurred – prior accident years | (104,876 | ) |  | (58,140 | ) |  | (1,110 | ) |  | (164,126 | ) |
| Net claims and claim expenses incurred – total | $ | 151,545 |  |  | $ | 380,396 |  |  | $ | (1,110 | ) |  | $ | 530,831 |  |
| Net claims and claim expense ratio – current accident year | 35.6 | % |  | 64.3 | % |  |  |  | 49.5 | % |
| Net claims and claim expense ratio – prior accident years | (14.6 | )% |  | (8.6 | )% |  |  |  | (11.7 | )% |
| Net claims and claim expense ratio – calendar year | 21.0 | % |  | 55.7 | % |  |  |  | 37.8 | % |
| Underwriting expense ratio | 28.6 | % |  | 41.2 | % |  |  |  | 34.7 | % |
| Combined ratio | 49.6 | % |  | 96.9 | % |  |  |  | 72.5 | % |
Schedule of Gross Premiums Written Allocated to the Territory of Coverage Exposure | The following is a summary of the Company’s gross premiums written allocated to the territory of coverage exposure:
| Year ended December 31, | 2018 |  | 2017 |  | 2016 |
| Property |  |  |  |  |  |
| U.S. and Caribbean | $ | 978,063 |  |  | $ | 954,269 |  |  | $ | 743,226 |  |
| Worldwide | 464,311 |  |  | 305,915 |  |  | 210,168 |  |
| Europe | 144,857 |  |  | 49,486 |  |  | 37,611 |  |
| Japan | 71,601 |  |  | 49,821 |  |  | 44,536 |  |
| Worldwide (excluding U.S.) (1) | 66,872 |  |  | 48,182 |  |  | 55,043 |  |
| Australia and New Zealand | 19,273 |  |  | 14,151 |  |  | 13,729 |  |
| Other | 15,949 |  |  | 18,613 |  |  | 6,950 |  |
| Total Property | 1,760,926 |  |  | 1,440,437 |  |  | 1,111,263 |  |
| Casualty and Specialty |  |  |  |  |  |
| Worldwide | 776,976 |  |  | 686,253 |  |  | 581,972 |  |
| U.S. and Caribbean | 667,125 |  |  | 622,757 |  |  | 646,381 |  |
| Worldwide (excluding U.S.) (1) | 31,734 |  |  | 10,104 |  |  | 13,840 |  |
| Europe | 15,296 |  |  | 9,752 |  |  | 5,541 |  |
| Australia and New Zealand | 3,667 |  |  | 4,141 |  |  | 5,073 |  |
| Other | 54,703 |  |  | 24,103 |  |  | 10,506 |  |
| Total Casualty and Specialty | 1,549,501 |  |  | 1,357,110 |  |  | 1,263,313 |  |
| Other category | — |  |  | (7 | ) |  | — |  |
| Total gross premiums written | $ | 3,310,427 |  |  | $ | 2,797,540 |  |  | $ | 2,374,576 |  |
(1) | The category “Worldwide (excluding U.S.)” consists of contracts that cover more than one geographic region (other than the U.S.).

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