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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

X

- Definition

Maturity Term for Reverse Repurchase Agreements

+ References

No definition available.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894

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- Definition

The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(2)(i))

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- Definition

The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

+ 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)

-URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729



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

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-Name Accounting Standards Codification

-Topic 860

-SubTopic 10

-Section 05

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7517284&loc=d3e93645-111703

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