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Securities purchased under an agreement to sell (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Investment Holdings [Line Items]            
Reverse repurchase agreements outstanding $ 19.9us-gaap_SecuritiesForReverseRepurchaseAgreements   $ 19.9us-gaap_SecuritiesForReverseRepurchaseAgreements   $ 38.1us-gaap_SecuritiesForReverseRepurchaseAgreements $ 60.4us-gaap_SecuritiesForReverseRepurchaseAgreements
Securities received as collateral 19.4us-gaap_SecuritiesReceivedAsCollateral   19.4us-gaap_SecuritiesReceivedAsCollateral   37.6us-gaap_SecuritiesReceivedAsCollateral 60.0us-gaap_SecuritiesReceivedAsCollateral
Reverse repurchase agreements            
Investment Holdings [Line Items]            
Foreign currency gain (loss) $ (2.4)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= tpre_ReverseRepurchaseAgreementsMember
$ 1.2us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= tpre_ReverseRepurchaseAgreementsMember
$ (2.6)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= tpre_ReverseRepurchaseAgreementsMember
$ 1.3us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= tpre_ReverseRepurchaseAgreementsMember
$ 1.9us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= tpre_ReverseRepurchaseAgreementsMember
$ 0.6us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= tpre_ReverseRepurchaseAgreementsMember
Minimum            
Investment Holdings [Line Items]            
Maturity term for reverse repurchase agreements     30 days   30 days  
Maximum            
Investment Holdings [Line Items]            
Maturity term for reverse repurchase agreements     90 days   90 days