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Reserves for Losses and Adjustment Expenses - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Insurance [Abstract]
Provision for losses and LAE for claims incurred	$ 6.4	$ 7.3
Prior years	6.4	7.3
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]
Prior years	6.4	$ 7.3
Reinsurance
Insurance [Abstract]
Provision for losses and LAE for claims incurred	(2.1)
Prior years	(2.1)
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]
Prior years	(2.1)
Insurance
Insurance [Abstract]
Provision for losses and LAE for claims incurred	8.5
Prior years	8.5
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]
Prior years	8.5
Insurance | Reinsurance Contracts [Axis]: LPT, deferred gain
Insurance [Abstract]
Provision for losses and LAE for claims incurred	13.2
Prior years	13.2
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]
Prior years	13.2
Insurance | Reinsurance Contracts [Axis]: LPT, offset post-LPT years
Insurance [Abstract]
Provision for losses and LAE for claims incurred	4.7
Prior years	4.7
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]
Prior years	$ 4.7

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- Definition

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+ References

No definition available.

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- Definition

Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

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