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Guarantees and Indemnifications Guarantees (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Guarantees [Abstract]
Total of Loans Covered by Guarantees	$ 304.0	$ 305.0
Total of Guaranteed Loans Inquired About	1.5	0.7
Loan Repurchase Guarantee Liability	$ 0.5	$ 0.3

X

- Definition

Maximum potential amount of future payments the guarantor could be required to make under the Company's subsidiary loan repurchase guarantees.

+ References

No definition available.

+ Details

Name:	mho_LoanRepurchaseGuaranteeLiability
Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total of loans covered by the guarantees discussed for which inquiries were made by the purchasers of the loans.

+ References

No definition available.

+ Details

Name:	mho_TotalOfGuaranteedLoansInquiredAbout
Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The total amount of loans covered by guarantees that said loans could potentially be repurchased in the case certain conditions occur.

+ References

No definition available.

+ Details

Name:	mho_TotalOfLoansCoveredByGuarantees
Namespace Prefix:	mho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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