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Summary of Significant Accounting Policies - Summary of Rollforward of Allowance for Doubtful Accounts (Parenthetical) (Details) $ in Millions	12 Months Ended
	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

Name:	man_BadDebtWriteOff
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