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Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Feb. 18, 2015
Jun. 30, 2014
Document And Entity Information [Abstract]      
Entity Registrant Name RENAISSANCERE HOLDINGS LTD.    
Trading Symbol RNR    
Entity Central Index Key 0000913144    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   38,330,334dei_EntityCommonStockSharesOutstanding  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 4,203.6dei_EntityPublicFloat