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Commitments and Contingencies - Letters of credit (Details) (Letter of Credit, USD $) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Jul. 09, 2014 | Jul. 08, 2014 | Dec. 31, 2012
Line of Credit Facility [Line Items] |  |  |  |  |
Facility | $ 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | $ 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  | $ 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Letters of credit outstanding | 160,100,000 us-gaap_LineOfCreditFacilityAmountOutstanding | 127,300,000 us-gaap_LineOfCreditFacilityAmountOutstanding |  |  | 60,900,000 us-gaap_LineOfCreditFacilityAmountOutstanding
Letters of credit outstanding as percentage of total facility | 40.00%tpre_LineofCreditFacilityAmountOutstandingAsAPercentageofMaximumBorrowingCapacity | 42.40%tpre_LineofCreditFacilityAmountOutstandingAsAPercentageofMaximumBorrowingCapacity |  |  | 15.30%tpre_LineofCreditFacilityAmountOutstandingAsAPercentageofMaximumBorrowingCapacity
Restricted cash and cash equivalents |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Cash and cash equivalents pledged as security | 160,600,000 us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForLetterOfCreditFacilities / us-gaap_BalanceSheetLocationAxis = tpre_RestrictedCashandCashEquivalentsMember / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | 100,600,000 us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForLetterOfCreditFacilities / us-gaap_BalanceSheetLocationAxis = tpre_RestrictedCashandCashEquivalentsMember / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |  |  | 64,800,000 us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForLetterOfCreditFacilities / us-gaap_BalanceSheetLocationAxis = tpre_RestrictedCashandCashEquivalentsMember / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
BNP Paribas |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Facility | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_BNPParibasMember | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_BNPParibasMember |  |  |
Notice period (Unused Facility Portion) | 60 days | 60 days |  |  |
Citibank |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Facility | 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_CitibankMember | 150,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_CitibankMember | 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_CitibankMember | 150,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_CitibankMember | 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_CitibankMember
Notice period (Unused Facility Portion) | 90 days | 90 days |  |  |
J.P. Morgan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Facility | $ 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_J.P.MorganMember | $ 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = tpre_J.P.MorganMember |  |  |
Notice period (Unused Facility Portion) | 60 days | 60 days |  |  |

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- Definition Line of Credit Facility, Amount Outstanding, As A Percentage of Maximum Borrowing Capacity + References No definition available. + Details
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Namespace Prefix: | tpre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Termination Notice Period For Line of Credit Facilities + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 + Details
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