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Organization Acquisition (Details) (Scenario, Forecast, Platinum, USD $)
In Billions, unless otherwise specified
0 Months Ended
Mar. 02, 2015
Scenario, Forecast | Platinum
 
Business Acquisition [Line Items]  
Aggregate consideration $ 1.9us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= rnr_PlatinumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember