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Commitments and Contingencies (Detail) $ in Millions	Jun. 30, 2024 USD ($)
Reinsurance Contracts: 2025 Reinsurance Contract
Reinsurance Retention Policy [Line Items]
Reinsurance payable, due in fiscal year	$ 73.8
Reinsurance Contracts: 2026 Reinsurance Contract
Reinsurance Retention Policy [Line Items]
Reinsurance payable, due in second year	127.3
Reinsurance Contracts: 2027 Reinsurance Contract
Reinsurance Retention Policy [Line Items]
Reinsurance payable, due in third year	$ 53.5

X

- Definition

Amount of commitment classified as other to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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

X

- Definition

Amount of commitment classified as other to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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

X

- Definition

Amount of commitment classified as other to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentDueInThirdYear
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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479838/944-20-50-3

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Period Type:	duration

X

- Details

Name:	us-gaap_ReinsuranceContractAxis=2025 Reinsurance Contract
Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_ReinsuranceContractAxis=2026 Reinsurance Contract
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ReinsuranceContractAxis=2027 Reinsurance Contract
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Period Type: