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Senior Notes payable and letter of credit facilities - Letters of credit (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Line of Credit Facility [Line Items] |
Line of Credit Facility, Fair Value of Amount Outstanding | $ 303,387
Restricted cash securing credit facilities and reinsurance contracts | 306,032
Committed, secured facility [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Maximum Borrowing Capacity | 225,000
Line of Credit Facility, Fair Value of Amount Outstanding | 99,638
Restricted cash securing credit facilities and reinsurance contracts | 102,283
Uncommitted, unsecured facility [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Fair Value of Amount Outstanding | 203,749
Restricted cash securing credit facilities and reinsurance contracts | $ 203,749

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- Definition Restricted cash securing credit facilities and reinsurance contracts + References No definition available. + Details
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Namespace Prefix: | spnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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=121572278&loc=d3e13433-108611 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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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Data Type: | xbrli:stringItemType
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Period Type: | duration

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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://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=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |