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Reserves for Losses and Adjustment Expenses - Reconciliation of Reinsurance Recoverables on Unpaid Losses (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Provision for losses and LAE for claims incurred	$ 6.4	$ 7.3
Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Provision for losses and LAE for claims incurred	(2.1)
Reinsurance Contracts [Axis]: Retroactive Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance	2,132.0
Reinsurance recoverable for unpaid claims under retroactive reinsurance, beginning balance, Ending Balance	$ 1,877.3

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+ References

No definition available.

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- Definition

Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
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-URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

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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

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-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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