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Subsequent events (Details) (Subsequent Event)
Jan. 05, 2015
Subsequent Event
  
Subsequent Event [Line Items]  
Percentage of Catastrophe Fund Repurchased for Cancellation 15.00%tpre_PercentageofCatastropheFundRepurchasedforCancellation
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember