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Acquisition of Platinum Financial Results (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Business Acquisition [Line Items]      
Revenues $ 381,920,000us-gaap_Revenues $ 343,609,000us-gaap_Revenues  
Net income available to RenaissanceRe common shareholders 167,843,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 151,003,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic  
Platinum      
Business Acquisition [Line Items]      
Revenues     40,139,000us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= rnr_PlatinumMember
Net income available to RenaissanceRe common shareholders     (19,439,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_BusinessAcquisitionAxis
= rnr_PlatinumMember
Compensation-related costs     $ 28,000,000us-gaap_SeveranceCosts1
/ us-gaap_BusinessAcquisitionAxis
= rnr_PlatinumMember