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Guarantees and Indemnifications Guarantees (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Guarantees [Abstract] |  |
Total of Loans Covered by Guarantees | $ 66.8 | $ 21.1
Total of Guaranteed Loans Inquired About | 1.7 | 0.6
Loan Repurchase Guarantee Liability | $ 0.6 | $ 0.4

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