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Acquisition of Platinum Narrative (Details) - USD ($)					3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Mar. 24, 2015	Mar. 02, 2015	Jun. 30, 2015	Mar. 01, 2015	Dec. 31, 2014	Jun. 30, 2015
Bridge Loan
Business Acquisition [Line Items]
Short-term debt				$ 300,000,000
Common Shares
Business Acquisition [Line Items]
Dividends per common share, in usd per share	$ 0.3	$ 0.3
Platinum
Business Acquisition [Line Items]
Dividends per common share, in usd per share						$ 10
Dividends paid, value				253,203,000		$ 253,203,000
Funds available to fund acquisition				$ 604,400,000
RenaissanceRe Finance, Inc. | 3.700% Senior Notes Due April 1, 2025
Business Acquisition [Line Items]
Debt issued			$ 300,000,000
Senior notes interest rate			3.70%
Debt instrument maturity date			April 1, 2025
Platinum
Business Acquisition [Line Items]
Percent acquired				100.00%
Share price, in usd per share				$ 76
Aggregate consideration transferred				$ 1,932,405,000
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards				1,160,000,000
Transaction-related costs							$ 6,700,000	$ 48,200,000
Acquisition-related costs								12,500,000
Integration-related costs								3,700,000
Compensation-related costs								32,000,000
Goodwill				191,729,000
Finite lived intangible assets acquired				$ 75,200,000
Weighted average useful life				8 years
Indefinite lived intangible assets acquired				$ 8,400,000
Adjustment to deferred tax asset				29,069,000
Total adjustments for fair value of the identifiable intangible assets				$ (13,115,000)
Reduction in deferred tax asset valuation allowance								47,400,000
Platinum | Common Shares
Business Acquisition [Line Items]
Share price, in usd per share				$ 35.96
Shares issued				7,434,561
Shares issued, value				$ 761,819,000
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards				$ 904,433,000
Platinum | Platinum
Business Acquisition [Line Items]
Transaction-related costs					$ 5,800,000			$ 34,200,000

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