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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
	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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