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Fair Value Measurements (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 9 Months Ended |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Fixed maturity investments | Sep. 30, 2014 Fixed maturity investments | Sep. 30, 2014 Other Investments Net investment income | Sep. 30, 2013 Other Investments Net investment income | Sep. 30, 2014 Other Investments Net investment income | Sep. 30, 2013 Other Investments Net investment income | Sep. 30, 2014 Other Assets and Liabilities Other income (loss) | Sep. 30, 2013 Other Assets and Liabilities Other income (loss) | Sep. 30, 2014 Other Assets and Liabilities Other income (loss) | Sep. 30, 2013 Other Assets and Liabilities Other income (loss) | Mar. 31, 2010 5.75% Senior Notes Due March 15, 2020 RenRe North America Holdings Inc. | Sep. 30, 2014 5.75% Senior Notes Due March 15, 2020 RenRe North America Holdings Inc. | Dec. 31, 2013 5.75% Senior Notes Due March 15, 2020 RenRe North America Holdings Inc. | Mar. 17, 2010 5.75% Senior Notes Due March 15, 2020 RenRe North America Holdings Inc. | Sep. 30, 2014 Quoted Prices In Active Markets For Identical Assets (Level 1) | Dec. 31, 2013 Quoted Prices In Active Markets For Identical Assets (Level 1) | Sep. 30, 2014 Significant Other Observable Inputs (Level 2) | Dec. 31, 2013 Significant Other Observable Inputs (Level 2) | Sep. 30, 2014 Significant Other Observable Inputs (Level 2) Cash Settled Restricted Stock Unit | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) | Dec. 31, 2013 Significant Unobservable Inputs (Level 3) | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Fixed maturity investments | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Minimum Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Maximum Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Weighted Average or Actual Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Weighted Average or Actual Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Minimum Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Maximum Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Weighted Average or Actual Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Discounted Cash Flow Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Weighted Average or Actual Discounted Cash Flow Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Weather Contract Internal Valuation Model Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private Equity Funds Net Asset Valuation Technique | Sep. 30, 2014 U.S. treasuries | Dec. 31, 2013 U.S. treasuries | Sep. 30, 2014 Agencies | Dec. 31, 2013 Agencies | Sep. 30, 2014 Non-U.S. government (Sovereign Debt) | Dec. 31, 2013 Non-U.S. government (Sovereign Debt) | Sep. 30, 2014 Non-U.S. government-backed corporate | Dec. 31, 2013 Non-U.S. government-backed corporate | Sep. 30, 2014 Corporate | Dec. 31, 2013 Corporate | Sep. 30, 2014 Agency mortgage-backed | Dec. 31, 2013 Agency mortgage-backed | Sep. 30, 2014 Non-agency prime residential mortgage-backed | Dec. 31, 2013 Non-agency prime residential mortgage-backed | Sep. 30, 2014 AltA non-agency mortgage-backed | Dec. 31, 2013 AltA non-agency mortgage-backed | Sep. 30, 2014 Commercial mortgage-backed | Dec. 31, 2013 Commercial mortgage-backed | Sep. 30, 2014 Asset-backed | Dec. 31, 2013 Asset-backed | Sep. 30, 2014 Senior secured bank loan funds | Sep. 30, 2014 Private equity partnerships | Sep. 30, 2014 Hedge funds | Jun. 30, 2014 Convertible Preferred Equity Trupanion | Sep. 30, 2014 Common Shares Trupanion | Jul. 28, 2014 Common Shares Trupanion | Sep. 30, 2014 Call Rights Significant Unobservable Inputs (Level 3) Internal Valuation Model Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net transfers out of Level 3 | $ (24,644,000) | $ (24,644,000) |  |  | $ (24,644,000) | $ (24,644,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,281,000 |  |  |  |  |  |  |  |  |  |  |  |  | 254,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average effective yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 0.80% | 1.50% | 1.30% | 1.20% | 1.30% | 1.40% | 1.10% | 3.00% | 2.70% | 2.60% | 2.90% | 3.20% | 3.70% | 3.90% | 4.70% | 2.20% | 2.10% | 1.60% | 2.00% |  |  |  |  |  |  |
Weighted average life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years 2 months 12 days | 6 years 2 months 12 days | 4 years 3 months 18 days | 4 years 4 months 24 days | 5 years 0 months 0 days | 4 years | 4 years | 3 years 3 months 18 days | 2 years 8 months 12 days | 3 years 6 months |  |  |  |  |  |  |
Other assets and (liabilities) | (17,272,000) | (17,272,000) |  | (8,233,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 479,000 | 823,000 | (10,480,000) | (6,566,000) | (8,500,000) | (7,271,000) | (2,490,000) |  | (7,281,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 330,906,000 |  | 15,936,000 |  | 2,718,000 |  |  |  | 18,723,000 |  | 300,800,000 |  |  |  | 15,936,000 |  |  | 300,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 264,000
Investment Owned, Balance, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.5 |
Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.00 |
Investment Owned, at Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,200,000 | 20,900,000 | 24,600,000 |
Dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit spread |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% |  | 0.50% |  | (13.90%) | 8.30% | (0.40%) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.75% Senior notes issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | March 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 271,000,000 | 273,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) recognized in earnings |  | 2,908,000 | 33,836,000 |  |  |  | (6,000,000) | 22,900,000 | 2,900,000 | 32,600,000 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum estimated liquidation period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 7 years |  |  |  |  |
Maximum estimated liquidation period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 10 years |  |  |  |  |
Investment in closed end fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,700,000 |  |  |  |  |  |
Hedge fund side pocket investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,700,000 |  |  |  |

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