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Investments - Narrative (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Jan. 02, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 18, 2014
Fair Value Disclosures [Abstract]          
Securities valued based on dealer quotes or other quoted market prices for similar securities   $ 434.4us-gaap_SecurityOwnedNotReadilyMarketableQuotedValue $ 483.2us-gaap_SecurityOwnedNotReadilyMarketableQuotedValue    
Percent of securities valued based on dealer quotes or other quoted market prices for similar securities   23.50%tpre_SecurityOwnedNotReadilyMarketableQuotedPricePercent 33.10%tpre_SecurityOwnedNotReadilyMarketableQuotedPricePercent    
Securities sold, not yet purchased, valued based on dealer quotes or other quoted market prices for similar securities   1.3us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased 41.0us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased    
Percent of securities sold, not yet purchased, valued based on dealer quotes or other quoted market prices for similar securities   1.40%tpre_SecurityOwnedandSoldNotYetPurchasedNotReadilyMarketableQuotedPricePercent 73.10%tpre_SecurityOwnedandSoldNotYetPurchasedNotReadilyMarketableQuotedPricePercent    
Private common equity securities   2.3tpre_FinancialInstrumentsOwnedPrivateSecuritiesatFairValue 3.3tpre_FinancialInstrumentsOwnedPrivateSecuritiesatFairValue    
Securities fair valued by using information obtained from the Company's Investment Manager representing less than 1% of total investments in securities and commodities   1.00%tpre_PrivateSecuritiesPercentofInvestmentinSecuritiesandCommodities 1.00%tpre_PrivateSecuritiesPercentofInvestmentinSecuritiesandCommodities    
Asset transfers from level 1 to level 2   0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount    
Liability transfers from level 1 to level 2   0us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount 0us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount    
Liability transfers from level 2 to level 1   0us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount 0us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount    
Total unrealized gain (loss) related to fair value assets using significant unobservable inputs (Level 3   (7.4)tpre_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetsUnrealizedGainLoss 1.0tpre_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetsUnrealizedGainLoss (0.7)tpre_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetsUnrealizedGainLoss  
Investment [Line Items]          
Asset transfers from level 2 to level 1     0us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount    
Equity securities          
Investment [Line Items]          
Asset transfers from level 2 to level 1   86.6us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Kiskadee Re Ltd. [Member]          
Investment [Line Items]          
Committed capital         25.0tpre_CommittedCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tpre_KiskadeeReLtd.Member
Subsequent event | Kiskadee Re Ltd. [Member]          
Investment [Line Items]          
Committed capital 20.0tpre_CommittedCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tpre_KiskadeeReLtd.Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Capital distributed $ 5.0tpre_CommittedCapitalAmountDistributed
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= tpre_KiskadeeReLtd.Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember