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Summary of Significant Accounting Policies - Summary of Rollforward of Allowance for Doubtful Accounts (Parenthetical) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Accounting Policies [Abstract] |
Bad debt write-off | $ 24.7

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- Definition Bad Debt Write Off + References No definition available. + Details
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Namespace Prefix: | man_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration