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Senior Notes payable and letter of credit facilities - Letters of credit (Details) - USD ($)	Dec. 31, 2019	Jul. 30, 2019
Letter of Credit
Line of Credit Facility [Line Items]
Issued	$ 251,837,000
Cash and Cash Equivalents	254,176,000
Letter of Credit | Unsecured facility [Member]
Line of Credit Facility [Line Items]
Committed Capacity		$ 200,000,000.0
Uncommitted, unsecured facility [Member]
Line of Credit Facility [Line Items]
Issued	187,135,000
Cash and Cash Equivalents	189,474,000
Committed, secured facility [Member]
Line of Credit Facility [Line Items]
Committed Capacity	225,000,000
Issued	64,702,000
Cash and Cash Equivalents	$ 64,702,000

X

- Definition

Restricted cash securing credit facilities and reinsurance contracts

+ References

No definition available.

+ Details

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

X

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

+ Details

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

X

- 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

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

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Period Type: