XML 60 R49.htm IDEA: XBRL DOCUMENT v3.25.1

Investments - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($) security
Debt and Equity Securities, FV-NI [Line Items]
Number of available-for-sale investment securities in the twelve month or more category (security) | security	461	518
Weighted average duration of debt securities	3 years	3 years 1 month 6 days
Sub-prime
Debt and Equity Securities, FV-NI [Line Items]
Debt securities	$ 137.3	$ 161.2
Sub-prime | AAA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities	82.2	94.9
Sub-prime | AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities	28.1	31.8
Sub-prime | A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities	7.2	8.2
Sub-prime | BBB
Debt and Equity Securities, FV-NI [Line Items]
Debt securities	15.8	24.9
Sub-prime | Unrated
Debt and Equity Securities, FV-NI [Line Items]
Debt securities	$ 4.0	$ 1.4

X

- Definition

Debt Securities, Net of Securities Sold, Not Yet Purchased, Weighted-Average Duration

+ References

No definition available.

+ Details

Name:	spnt_DebtSecuritiesNetOfSecuritiesSoldNotYetPurchasedWeightedAverageDuration
Namespace Prefix:	spnt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-4

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-1

+ Details

Name:	us-gaap_DebtSecuritiesTradingAndAvailableForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B

+ Details

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

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubprimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	spnt_CreditRatingAxis=spnt_AAARatingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	spnt_CreditRatingAxis=spnt_AARatingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	spnt_CreditRatingAxis=spnt_ARatingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	spnt_CreditRatingAxis=spnt_BBBRatingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	spnt_CreditRatingAxis=spnt_UnratedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: