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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2015
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 is as follows:
| Year ended December 31, 2015 | Catastrophe Reinsurance |  | Specialty Reinsurance |  | Lloyd’s |  | Other |  | Total |
| Gross premiums written (1) | $ | 868,631 |  |  | $ | 766,051 |  |  | $ | 376,718 |  |  | $ | (90 | ) |  | $ | 2,011,310 |  |
| Net premiums written | $ | 557,369 |  |  | $ | 582,909 |  |  | $ | 275,953 |  |  | $ | (48 | ) |  | $ | 1,416,183 |  |
| Net premiums earned | $ | 622,714 |  |  | $ | 548,810 |  |  | $ | 229,075 |  |  | $ | (48 | ) |  | $ | 1,400,551 |  |
| Net claims and claim expenses incurred | 75,574 |  |  | 244,495 |  |  | 128,667 |  |  | (498 | ) |  | 448,238 |  |
| Acquisition expenses | 47,264 |  |  | 135,811 |  |  | 55,269 |  |  | 248 |  |  | 238,592 |  |
| Operational expenses | 93,494 |  |  | 70,525 |  |  | 54,827 |  |  | 266 |  |  | 219,112 |  |
| Underwriting income (loss) | $ | 406,382 |  |  | $ | 97,979 |  |  | $ | (9,688 | ) |  | $ | (64 | ) |  | 494,609 |  |
| Net investment income |  |  |  |  |  |  | 152,567 |  |  | 152,567 |  |
| Net foreign exchange losses |  |  |  |  |  |  | (3,051 | ) |  | (3,051 | ) |
| Equity in earnings of other ventures |  |  |  |  |  |  | 20,481 |  |  | 20,481 |  |
| Other income |  |  |  |  |  |  | 13,472 |  |  | 13,472 |  |
| Net realized and unrealized losses on investments |  |  |  |  |  |  | (68,918 | ) |  | (68,918 | ) |
| Corporate expenses |  |  |  |  |  |  | (77,114 | ) |  | (77,114 | ) |
| Interest expense |  |  |  |  |  |  | (35,670 | ) |  | (35,670 | ) |
| Income before taxes and noncontrolling interests |  |  |  |  |  |  |  |  | 496,376 |  |
| Income tax benefit |  |  |  |  |  |  | 45,866 |  |  | 45,866 |  |
| Net income attributable to noncontrolling interests |  |  |  |  |  |  | (111,050 | ) |  | (111,050 | ) |
| Dividends on preference shares |  |  |  |  |  |  | (22,381 | ) |  | (22,381 | ) |
| Net income available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | $ | 408,811 |  |
| Net claims and claim expenses incurred – current accident year | $ | 145,951 |  |  | $ | 336,407 |  |  | $ | 128,327 |  |  | $ | — |  |  | $ | 610,685 |  |
| Net claims and claim expenses incurred – prior accident years | (70,377 | ) |  | (91,912 | ) |  | 340 |  |  | (498 | ) |  | (162,447 | ) |
| Net claims and claim expenses incurred – total | $ | 75,574 |  |  | $ | 244,495 |  |  | $ | 128,667 |  |  | $ | (498 | ) |  | $ | 448,238 |  |
| Net claims and claim expense ratio – current accident year | 23.4 | % |  | 61.3 | % |  | 56.0 | % |  |  |  | 43.6 | % |
| Net claims and claim expense ratio – prior accident years | (11.3 | )% |  | (16.7 | )% |  | 0.2 | % |  |  |  | (11.6 | )% |
| Net claims and claim expense ratio – calendar year | 12.1 | % |  | 44.6 | % |  | 56.2 | % |  |  |  | 32.0 | % |
| Underwriting expense ratio | 22.6 | % |  | 37.5 | % |  | 48.0 | % |  |  |  | 32.7 | % |
| Combined ratio | 34.7 | % |  | 82.1 | % |  | 104.2 | % |  |  |  | 64.7 | % |
(1) Included in gross premiums written in the Other category is inter-segment gross premiums written of $0.1 million.
| Year ended December 31, 2014 | Catastrophe Reinsurance |  | Specialty Reinsurance |  | Lloyd’s |  | Other |  | Total |
| Gross premiums written (1) | $ | 933,969 |  |  | $ | 346,638 |  |  | $ | 269,656 |  |  | $ | 309 |  |  | $ | 1,550,572 |  |
| Net premiums written | $ | 541,608 |  |  | $ | 295,855 |  |  | $ | 230,429 |  |  | $ | 344 |  |  | $ | 1,068,236 |  |
| Net premiums earned | $ | 590,845 |  |  | $ | 253,537 |  |  | $ | 217,666 |  |  | $ | 368 |  |  | $ | 1,062,416 |  |
| Net claims and claim expenses incurred | 1,757 |  |  | 88,502 |  |  | 113,825 |  |  | (6,137 | ) |  | 197,947 |  |
| Acquisition expenses | 43,161 |  |  | 60,936 |  |  | 46,927 |  |  | (6,548 | ) |  | 144,476 |  |
| Operational expenses | 95,851 |  |  | 43,370 |  |  | 51,115 |  |  | 303 |  |  | 190,639 |  |
| Underwriting income | $ | 450,076 |  |  | $ | 60,729 |  |  | $ | 5,799 |  |  | $ | 12,750 |  |  | 529,354 |  |
| Net investment income |  |  |  |  |  |  | 124,316 |  |  | 124,316 |  |
| Net foreign exchange gains |  |  |  |  |  |  | 6,260 |  |  | 6,260 |  |
| Equity in earnings of other ventures |  |  |  |  |  |  | 26,075 |  |  | 26,075 |  |
| Other loss |  |  |  |  |  |  | (423 | ) |  | (423 | ) |
| Net realized and unrealized gains on investments |  |  |  |  |  |  | 41,433 |  |  | 41,433 |  |
| Corporate expenses |  |  |  |  |  |  | (22,987 | ) |  | (22,987 | ) |
| Interest expense |  |  |  |  |  |  | (17,164 | ) |  | (17,164 | ) |
| Income before taxes and noncontrolling interests |  |  |  |  |  |  |  |  | 686,864 |  |
| Income tax expense |  |  |  |  |  |  | (608 | ) |  | (608 | ) |
| Net income attributable to noncontrolling interests |  |  |  |  |  |  | (153,538 | ) |  | (153,538 | ) |
| Dividends on preference shares |  |  |  |  |  |  | (22,381 | ) |  | (22,381 | ) |
| Net income available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | $ | 510,337 |  |
| Net claims and claim expenses incurred – current accident year | $ | 67,268 |  |  | $ | 144,411 |  |  | $ | 130,066 |  |  | $ | — |  |  | $ | 341,745 |  |
| Net claims and claim expenses incurred – prior accident years | (65,511 | ) |  | (55,909 | ) |  | (16,241 | ) |  | (6,137 | ) |  | (143,798 | ) |
| Net claims and claim expenses incurred – total | $ | 1,757 |  |  | $ | 88,502 |  |  | $ | 113,825 |  |  | $ | (6,137 | ) |  | $ | 197,947 |  |
| Net claims and claim expense ratio – current accident year | 11.4 | % |  | 57.0 | % |  | 59.8 | % |  |  |  | 32.2 | % |
| Net claims and claim expense ratio – prior accident years | (11.1 | )% |  | (22.1 | )% |  | (7.5 | )% |  |  |  | (13.6 | )% |
| Net claims and claim expense ratio – calendar year | 0.3 | % |  | 34.9 | % |  | 52.3 | % |  |  |  | 18.6 | % |
| Underwriting expense ratio | 23.5 | % |  | 41.1 | % |  | 45.0 | % |  |  |  | 31.6 | % |
| Combined ratio | 23.8 | % |  | 76.0 | % |  | 97.3 | % |  |  |  | 50.2 | % |
(1) Included in gross premiums written in the Other category is inter-segment gross premiums written of $0.3 million.
| Year ended December 31, 2013 | Catastrophe Reinsurance |  | Specialty Reinsurance |  | Lloyd’s |  | Other |  | Total |
| Gross premiums written (1) | $ | 1,120,379 |  |  | $ | 259,489 |  |  | $ | 226,532 |  |  | $ | (988 | ) |  | $ | 1,605,412 |  |
| Net premiums written | $ | 753,078 |  |  | $ | 248,562 |  |  | $ | 201,697 |  |  | $ | 610 |  |  | $ | 1,203,947 |  |
| Net premiums earned | $ | 723,705 |  |  | $ | 214,306 |  |  | $ | 176,029 |  |  | $ | 586 |  |  | $ | 1,114,626 |  |
| Net claims and claim expenses incurred | 7,908 |  |  | 67,236 |  |  | 95,693 |  |  | 450 |  |  | 171,287 |  |
| Acquisition expenses | 49,161 |  |  | 41,538 |  |  | 34,823 |  |  | (21 | ) |  | 125,501 |  |
| Operational expenses | 108,130 |  |  | 31,780 |  |  | 50,540 |  |  | 655 |  |  | 191,105 |  |
| Underwriting income (loss) | $ | 558,506 |  |  | $ | 73,752 |  |  | $ | (5,027 | ) |  | $ | (498 | ) |  | 626,733 |  |
| Net investment income |  |  |  |  |  |  | 208,028 |  |  | 208,028 |  |
| Net foreign exchange gains |  |  |  |  |  |  | 1,917 |  |  | 1,917 |  |
| Equity in earnings of other ventures |  |  |  |  |  |  | 23,194 |  |  | 23,194 |  |
| Other loss |  |  |  |  |  |  | (2,359 | ) |  | (2,359 | ) |
| Net realized and unrealized gains on investments |  |  |  |  |  |  | 35,076 |  |  | 35,076 |  |
| Corporate expenses |  |  |  |  |  |  | (33,622 | ) |  | (33,622 | ) |
| Interest expense |  |  |  |  |  |  | (17,929 | ) |  | (17,929 | ) |
| Income from continuing operations before taxes and noncontrolling interests |  |  |  |  |  |  |  |  | 841,038 |  |
| Income tax expense |  |  |  |  |  |  | (1,692 | ) |  | (1,692 | ) |
| Income from discontinued operations |  |  |  |  |  |  | 2,422 |  |  | 2,422 |  |
| Net income attributable to noncontrolling interests |  |  |  |  |  |  | (151,144 | ) |  | (151,144 | ) |
| Dividends on preference shares |  |  |  |  |  |  | (24,948 | ) |  | (24,948 | ) |
| Net income available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | $ | 665,676 |  |
| Net claims and claim expenses incurred – current accident year | $ | 109,945 |  |  | $ | 101,347 |  |  | $ | 103,949 |  |  | $ | — |  |  | $ | 315,241 |  |
| Net claims and claim expenses incurred – prior accident years | (102,037 | ) |  | (34,111 | ) |  | (8,256 | ) |  | 450 |  |  | (143,954 | ) |
| Net claims and claim expenses incurred – total | $ | 7,908 |  |  | $ | 67,236 |  |  | $ | 95,693 |  |  | $ | 450 |  |  | $ | 171,287 |  |
| Net claims and claim expense ratio – current accident year | 15.2 | % |  | 47.3 | % |  | 59.1 | % |  |  |  | 28.3 | % |
| Net claims and claim expense ratio – prior accident years | (14.1 | )% |  | (15.9 | )% |  | (4.7 | )% |  |  |  | (12.9 | )% |
| Net claims and claim expense ratio – calendar year | 1.1 | % |  | 31.4 | % |  | 54.4 | % |  |  |  | 15.4 | % |
| Underwriting expense ratio | 21.7 | % |  | 34.2 | % |  | 48.5 | % |  |  |  | 28.4 | % |
| Combined ratio | 22.8 | % |  | 65.6 | % |  | 102.9 | % |  |  |  | 43.8 | % |
(1) Included in gross premiums written in the Other category is inter-segment gross premiums written of $1.0 million.
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, | 2015 |  | 2014 |  | 2013 |
| Catastrophe Reinsurance |  |  |  |  |  |
| U.S. and Caribbean | $ | 565,115 |  |  | $ | 573,696 |  |  | $ | 782,211 |  |
| Worldwide | 168,447 |  |  | 157,674 |  |  | 99,179 |  |
| Worldwide (excluding U.S.) (1) | 65,390 |  |  | 123,476 |  |  | 146,048 |  |
| Japan | 29,959 |  |  | 31,484 |  |  | 39,060 |  |
| Europe | 17,625 |  |  | 25,353 |  |  | 25,659 |  |
| Australia and New Zealand | 15,185 |  |  | 20,807 |  |  | 22,460 |  |
| Other | 6,910 |  |  | 1,479 |  |  | 5,762 |  |
| Total Catastrophe Reinsurance | 868,631 |  |  | 933,969 |  |  | 1,120,379 |  |
| Specialty Reinsurance |  |  |  |  |  |
| U.S. and Caribbean | 475,447 |  |  | 169,045 |  |  | 91,203 |  |
| Worldwide | 200,693 |  |  | 161,329 |  |  | 151,879 |  |
| Worldwide (excluding U.S.) (1) | 83,681 |  |  | 7,506 |  |  | 1,661 |  |
| Europe | 3,362 |  |  | 460 |  |  | 2,612 |  |
| Australia and New Zealand | 1,145 |  |  | 6,898 |  |  | 12,068 |  |
| Other | 1,723 |  |  | 1,400 |  |  | 66 |  |
| Total Specialty Reinsurance | 766,051 |  |  | 346,638 |  |  | 259,489 |  |
| Lloyd’s |  |  |  |  |  |
| Worldwide | 186,113 |  |  | 118,190 |  |  | 104,249 |  |
| U.S. and Caribbean | 154,104 |  |  | 120,066 |  |  | 88,535 |  |
| Worldwide (excluding U.S.) (1) | 14,896 |  |  | 13,655 |  |  | 8,071 |  |
| Europe | 12,922 |  |  | 7,609 |  |  | 14,763 |  |
| Japan | 2,432 |  |  | 2,695 |  |  | 1,907 |  |
| Australia and New Zealand | 1,166 |  |  | 2,907 |  |  | 2,948 |  |
| Other | 5,085 |  |  | 4,534 |  |  | 6,059 |  |
| Total Lloyd’s | 376,718 |  |  | 269,656 |  |  | 226,532 |  |
| Other category (2) | (90 | ) |  | 309 |  |  | (988 | ) |
| Total gross premiums written | $ | 2,011,310 |  |  | $ | 1,550,572 |  |  | $ | 1,605,412 |  |
(1) | The category “Worldwide (excluding U.S.)” consists of contracts that cover more than one geographic region (other than the U.S.).
(2) | The Other category consists of contracts that are primarily exposed to U.S. risks and includes inter-segment gross premiums written of $(0.1) million for 2015 (2014 - $0.3 million, 2013 - $(1.0) million).

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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