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Acquisition of Platinum Narrative (Details) - USD ($)						3 Months Ended		9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Mar. 24, 2015	Mar. 02, 2015	Mar. 01, 2015	Dec. 31, 2014	Sep. 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	$ 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	$ 51,900,000
Acquisition-related costs								12,600,000
Integration-related costs								4,500,000
Compensation-related costs								34,800,000
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

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