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Significant accounting policies - Income taxes and uncertain tax positions (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Apr. 01, 2014	Mar. 31, 2014	Apr. 01, 2015
Income Tax Contingency [Line Items]
Income tax expense	$ 1,542,000us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit	$ 3,917,000us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit
Provision for uncertain tax positions	1,700,000us-gaap_LiabilityForUncertainTaxPositionsCurrent		1,700,000us-gaap_LiabilityForUncertainTaxPositionsCurrent
Increase (decrease) in uncertain tax positions	(300,000)tpre_IncreasedecreaseinUncertainTaxPositions	0tpre_IncreasedecreaseinUncertainTaxPositions	(1,700,000)tpre_IncreasedecreaseinUncertainTaxPositions	0tpre_IncreasedecreaseinUncertainTaxPositions
Income Tax Expense [Member]
Income Tax Contingency [Line Items]
Investment income, tax expense	(1,200,000)tpre_InvestmentIncomeTaxExpense / us-gaap_IncomeStatementLocationAxis = tpre_IncomeTaxExpenseMember		(2,200,000)tpre_InvestmentIncomeTaxExpense / us-gaap_IncomeStatementLocationAxis = tpre_IncomeTaxExpenseMember
Net investment income
Income Tax Contingency [Line Items]
Investment income, tax expense		300,000tpre_InvestmentIncomeTaxExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember		700,000tpre_InvestmentIncomeTaxExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
TPRUK [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]
Income Tax Contingency [Line Items]
Corporate income tax rate					21.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = tpre_HerMajestysRevenueandCustomsHMRCMember / dei_LegalEntityAxis = tpre_TPRUKMember	23.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = tpre_HerMajestysRevenueandCustomsHMRCMember / dei_LegalEntityAxis = tpre_TPRUKMember
Income tax expense	$ 3,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = tpre_HerMajestysRevenueandCustomsHMRCMember / dei_LegalEntityAxis = tpre_TPRUKMember		$ 20,000us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = tpre_HerMajestysRevenueandCustomsHMRCMember / dei_LegalEntityAxis = tpre_TPRUKMember
TPRUK [Member] | Her Majesty's Revenue and Customs (HMRC) [Member] | Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
Corporate income tax rate							20.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = tpre_HerMajestysRevenueandCustomsHMRCMember / dei_LegalEntityAxis = tpre_TPRUKMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition

Increase (decrease) in Uncertain Tax Positions

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Investment Income, Tax Expense

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

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The current portion of the amount recognized for uncertain tax positions as of the balance sheet date.

+ 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 210.5-02.20)

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