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Acquisition of Platinum Narrative (Details) - USD ($)							3 Months Ended		12 Months Ended
	Dec. 15, 2015	Sep. 15, 2015	Jun. 15, 2015	Mar. 24, 2015	Mar. 13, 2015	Mar. 02, 2015	Mar. 01, 2015	Dec. 31, 2014	Dec. 31, 2015	Mar. 31, 2015
Common Shares
Business Acquisition [Line Items]
Dividends per common share, in usd per share	$ 0.3	$ 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
RenaissanceRe Finance, Inc. | 3.700% Senior Notes Due April 1, 2025
Business Acquisition [Line Items]
Debt instrument, face amount				$ 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
Funds available to fund acquisition						604,400,000
Transaction-related costs								$ 6,700,000	$ 53,500,000
Acquisition-related costs									11,800,000
Integration-related costs									5,400,000
Compensation-related costs									$ 36,300,000
Goodwill						191,729,000				$ 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
Other liabilities - deferred tax liability on identifiable intangible assets						$ (13,115,000)
Platinum | Bridge Loan
Business Acquisition [Line Items]
Short-term debt				$ 300,000,000
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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