Restricted cash securing credit facilities and reinsurance contracts

No definition available.

Name:	tpre_Restrictedcashsecuringcreditfacilitiesandreinsurancecontracts
Namespace Prefix:	tpre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

+ Details

Name:	us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	tpre_LetterofcreditfacilitytypeAxis=tpre_UnsecuredfacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	tpre_LetterofcreditfacilitytypeAxis=tpre_SecuredfacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=tpre_UnsecuredfacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Senior notes payable and letter of credit facilities (Letters of credit) (Details) - USD ($)	Sep. 30, 2018	Jul. 31, 2018	Dec. 31, 2017
Line of Credit Facility
Facility	$ 625,000,000
Utilized	262,630,000
Collateral	180,524,000		$ 867,600,000
Unsecured facility
Line of Credit Facility
Facility	200,000,000
Utilized	138,087,000
Secured facility [Member]
Line of Credit Facility
Facility	425,000,000
Utilized	124,543,000
Collateral	$ 180,524,000
Restricted cash securing letter of credit facilities \| Unsecured facility
Line of Credit Facility
Facility		$ 200,000,000.0