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Reserve for Loss and Loss Adjustment Expenses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Segment Reporting Information [Line Items]
Total AmTrust Reinsurance PPD	$ (7,788)	$ (7,788)
Legacy Reinsurance
Segment Reporting Information [Line Items]
Total AmTrust Reinsurance PPD	125	125
AmTrust Reinsurance
Segment Reporting Information [Line Items]
Total AmTrust Reinsurance PPD	$ (7,913)	$ (7,913)

X

- Definition

Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease), Net of Commission Changes

+ References

No definition available.

+ Details

Name:	mhld_LiabilityforUnpaidClaimsandClaimsAdjustmentExpensePeriodIncreaseDecreaseNetofCommissionChanges
Namespace Prefix:	mhld_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=mhld_LegacyReinsuranceSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=mhld_AmTrustReinsuranceSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: