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Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Gross premiums written | $ 667,336,000 | $ 641,563,000 | $ 1,331,487,000 | $ 1,252,068,000 | ||||||
| Net premiums written | 427,630,000 | 427,995,000 | 920,205,000 | 880,570,000 | ||||||
| Net premiums earned | 244,416,000 | 217,175,000 | 523,081,000 | 522,716,000 | ||||||
| Net claims and claim expenses incurred | 49,551,000 | 151,261,000 | 65,103,000 | 779,798,000 | ||||||
| Acquisition expenses | 25,608,000 | 13,883,000 | 49,719,000 | 46,218,000 | ||||||
| Operational expenses | 41,407,000 | 42,299,000 | 83,790,000 | 84,129,000 | ||||||
| Underwriting income (loss) | 127,850,000 | 9,732,000 | 324,469,000 | (387,429,000) | ||||||
| Net investment income | 14,743,000 | 33,328,000 | 81,714,000 | 93,609,000 | ||||||
| Net foreign exchange gains (losses) | 2,410,000 | (4,521,000) | 950,000 | (3,861,000) | ||||||
| Equity in earnings (losses) of other ventures | 6,846,000 | 5,128,000 | 12,316,000 | (18,625,000) | ||||||
| Other income (loss) | 11,289,000 | (5,167,000) | (27,805,000) | 44,978,000 | ||||||
| Net realized and unrealized gains on investments | 31,003,000 | 34,979,000 | 77,116,000 | 29,765,000 | ||||||
| Net other-than-temporary impairments | (209,000) | 0 | (343,000) | 0 | ||||||
| Corporate expenses | (4,067,000) | (4,011,000) | (8,878,000) | (6,075,000) | ||||||
| Interest expense | (5,716,000) | (5,730,000) | (11,434,000) | (11,925,000) | ||||||
| Income from continuing operations before taxes | 184,149,000 | 63,738,000 | 448,105,000 | (259,563,000) | ||||||
| Income tax expense | (898,000) | 1,773,000 | (861,000) | 1,825,000 | ||||||
| Income (loss) from discontinued operations | 1,393,000 | (10,094,000) | 1,220,000 | (11,620,000) | ||||||
| Net (income) loss attributable to noncontrolling interests | (33,624,000) | (21,903,000) | (87,265,000) | 63,589,000 | ||||||
| Dividends on preference shares | (8,750,000) | (8,750,000) | (17,500,000) | (17,500,000) | ||||||
| Net income (loss) available (attributable) to RenaissanceRe common shareholders | 142,270,000 | 24,764,000 | 343,699,000 | (223,269,000) | ||||||
| Net claims and claim expenses incurred - current accident year | 94,997,000 | 171,932,000 | 166,421,000 | 868,629,000 | ||||||
| Net claims and claim expenses incurred - prior accident years | (45,446,000) | (20,671,000) | (101,318,000) | (88,831,000) | ||||||
| Net claims and claim expenses incurred - total | 49,551,000 | 151,261,000 | 65,103,000 | 779,798,000 | ||||||
| Net claims and claim expense ratio - current accident year | 38.90% | 79.20% | 31.80% | 166.20% | ||||||
| Net claims and claim expense ratio - prior accident years | (18.60%) | (9.60%) | (19.40%) | (17.00%) | ||||||
| Net claims and claim expense ratio - calendar year | 20.30% | 69.60% | 12.40% | 149.20% | ||||||
| Underwriting expense ratio | 27.40% | 25.90% | 25.60% | 24.90% | ||||||
| Combined ratio | 47.70% | 95.50% | 38.00% | 174.10% | ||||||
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Reinsurance [Member]
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| Gross premiums written | 617,039,000 | 607,404,000 | 1,226,801,000 | 1,181,086,000 | ||||||
| Net premiums written | 379,369,000 | 395,856,000 | 838,007,000 | 819,422,000 | ||||||
| Net premiums earned | 214,296,000 | 199,461,000 | 468,114,000 | 488,890,000 | ||||||
| Net claims and claim expenses incurred | 35,488,000 | 143,219,000 | 43,812,000 | 738,623,000 | ||||||
| Acquisition expenses | 20,098,000 | 10,431,000 | 39,484,000 | 40,223,000 | ||||||
| Operational expenses | 30,346,000 | 32,901,000 | 62,390,000 | 65,264,000 | ||||||
| Underwriting income (loss) | 128,364,000 | 12,910,000 | 322,428,000 | (355,220,000) | ||||||
| Net claims and claim expenses incurred - current accident year | 76,631,000 | 162,398,000 | 131,775,000 | 829,760,000 | ||||||
| Net claims and claim expenses incurred - prior accident years | (41,143,000) | (19,179,000) | (87,963,000) | (91,137,000) | ||||||
| Net claims and claim expenses incurred - total | 35,488,000 | 143,219,000 | 43,812,000 | 738,623,000 | ||||||
| Net claims and claim expense ratio - current accident year | 35.80% | 81.40% | 28.20% | 169.70% | ||||||
| Net claims and claim expense ratio - prior accident years | (19.20%) | (9.60%) | (18.80%) | (18.60%) | ||||||
| Net claims and claim expense ratio - calendar year | 16.60% | 71.80% | 9.40% | 151.10% | ||||||
| Underwriting expense ratio | 23.50% | 21.70% | 21.70% | 21.60% | ||||||
| Combined ratio | 40.10% | 93.50% | 31.10% | 172.70% | ||||||
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Lloyd's [Member]
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| Gross premiums written | 50,297,000 | 34,126,000 | 105,114,000 | 70,746,000 | ||||||
| Net premiums written | 48,510,000 | 32,084,000 | 82,447,000 | 60,821,000 | ||||||
| Net premiums earned | 30,369,000 | 17,233,000 | 55,191,000 | 32,907,000 | ||||||
| Net claims and claim expenses incurred | 14,960,000 | 8,619,000 | 23,961,000 | 39,142,000 | ||||||
| Acquisition expenses | 5,510,000 | 3,305,000 | 10,178,000 | 5,766,000 | ||||||
| Operational expenses | 10,806,000 | 8,635,000 | 20,863,000 | 17,607,000 | ||||||
| Underwriting income (loss) | (907,000) | (3,326,000) | 189,000 | (29,608,000) | ||||||
| Net claims and claim expenses incurred - current accident year | 18,366,000 | 9,612,000 | 34,646,000 | 38,938,000 | ||||||
| Net claims and claim expenses incurred - prior accident years | (3,406,000) | (993,000) | (10,685,000) | 204,000 | ||||||
| Net claims and claim expenses incurred - total | 14,960,000 | 8,619,000 | 23,961,000 | 39,142,000 | ||||||
| Net claims and claim expense ratio - current accident year | 60.50% | 55.80% | 62.80% | 118.30% | ||||||
| Net claims and claim expense ratio - prior accident years | (11.20%) | (5.80%) | (19.40%) | 0.60% | ||||||
| Net claims and claim expense ratio - calendar year | 49.30% | 50.00% | 43.40% | 118.90% | ||||||
| Underwriting expense ratio | 53.70% | 69.30% | 56.30% | 71.10% | ||||||
| Combined ratio | 103.00% | 119.30% | 99.70% | 190.00% | ||||||
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Insurance [Member]
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| Gross premiums written | 0 | 33,000 | 0 | 313,000 | ||||||
| Net premiums written | (249,000) | 55,000 | (249,000) | 327,000 | ||||||
| Net premiums earned | (249,000) | 481,000 | (224,000) | 919,000 | ||||||
| Net claims and claim expenses incurred | (897,000) | (577,000) | (2,670,000) | 2,033,000 | ||||||
| Acquisition expenses | 0 | 147,000 | 57,000 | 229,000 | ||||||
| Operational expenses | 255,000 | 763,000 | 537,000 | 1,258,000 | ||||||
| Underwriting income (loss) | 393,000 | 148,000 | 1,852,000 | (2,601,000) | ||||||
| Net claims and claim expenses incurred - current accident year | 0 | (78,000) | 0 | (69,000) | ||||||
| Net claims and claim expenses incurred - prior accident years | (897,000) | (499,000) | (2,670,000) | 2,102,000 | ||||||
| Net claims and claim expenses incurred - total | (897,000) | (577,000) | (2,670,000) | 2,033,000 | ||||||
| Net claims and claim expense ratio - current accident year | 0.00% | (16.20%) | 0.00% | (7.50%) | ||||||
| Net claims and claim expense ratio - prior accident years | 360.20% | (103.80%) | 1192.00% | 228.70% | ||||||
| Net claims and claim expense ratio - calendar year | 360.20% | (120.00%) | 1192.00% | 221.20% | ||||||
| Underwriting expense ratio | (102.40%) | 189.20% | (265.20%) | 161.80% | ||||||
| Combined ratio | 257.80% | 69.20% | 926.80% | 383.00% | ||||||
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Eliminations [Member]
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| Gross premiums written | (428,000) | [1] | (77,000) | [2] | ||||||
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Other [Member]
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| 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 (loss) | 0 | 0 | 0 | 0 | ||||||
| Net investment income | 14,743,000 | 33,328,000 | 81,714,000 | 93,609,000 | ||||||
| Net foreign exchange gains (losses) | 2,410,000 | (4,521,000) | 950,000 | (3,861,000) | ||||||
| Equity in earnings (losses) of other ventures | 6,846,000 | 5,128,000 | 12,316,000 | (18,625,000) | ||||||
| Other income (loss) | 11,289,000 | (5,167,000) | (27,805,000) | 44,978,000 | ||||||
| Net realized and unrealized gains on investments | 31,003,000 | 34,979,000 | 77,116,000 | 29,765,000 | ||||||
| Net other-than-temporary impairments | (209,000) | (343,000) | ||||||||
| Corporate expenses | (4,067,000) | (4,011,000) | (8,878,000) | (6,075,000) | ||||||
| Interest expense | (5,716,000) | (5,730,000) | (11,434,000) | (11,925,000) | ||||||
| Income tax expense | (898,000) | 1,773,000 | (861,000) | 1,825,000 | ||||||
| Income (loss) from discontinued operations | 1,393,000 | (10,094,000) | 1,220,000 | (11,620,000) | ||||||
| Net (income) loss attributable to noncontrolling interests | (33,624,000) | (21,903,000) | (87,265,000) | 63,589,000 | ||||||
| Dividends on preference shares | (8,750,000) | (8,750,000) | (17,500,000) | (17,500,000) | ||||||
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Intersegment Elimination, Reinsurance Segment To Lloyds Segment Member
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| Gross premiums ceded from segment to segment | $ 400,000 | $ 100,000 | ||||||||
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