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Share-Based Compensation Plans - Performance Share Units (Details) - shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Performance Shares |  |  |  |  |
Payout Levels (in units): |  |  |  |  |
Threshold Award (in shares) | 0 | 0 | 61,076 | 59,698 |
Target Award (in shares) | 132,537 | 106,116 | 122,152 | 119,395 |
Outstanding Award (in shares) | 265,074 | 212,232 | 244,304 | 238,790 |
Payout Achieved Over Performance Period |  |  | 243,526 | 0 | [1]
Performance Shares 1 |  |  |  |  |
Payout Levels (in units): |  |  |  |  |
Threshold Award (in shares) |  | 0 | 39,882 |  |
Target Award (in shares) |  | 28,275 | 79,763 |  |
Outstanding Award (in shares) |  | 84,826 | 159,526 |  |
Shares Issued (in shares) | 159,526 |  |  |  |
Payout Achieved Over Performance Period |  |  | 159,526 |  |
[1] | (2) In the fourth quarter of 2022, the Committee exercised its discretion in respect of the payout of the 2020 grant. On the basis that an additional special one-time grant had been awarded in 2021 to supplement the 2020 grant, the Committee determined that the 2020 grant would have a zero payout.

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- Definition In the event the performance criteria exceeds the target performance level, an additional number of shares, up to the Outstanding Award level, may be granted. + References No definition available. + Details
Name: | man_OutstandingAward
Namespace Prefix: | man_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Payout levels. + References No definition available. + Details
Name: | man_PayoutLevelsInUnitsAbstract
Namespace Prefix: | man_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Achieved Over Performance Period + References No definition available. + Details
Name: | man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAchievedOverPerformancePeriod
Namespace Prefix: | man_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares under an equity-based award plan, other than a stock option plan, that were issued during the reporting period. + References No definition available. + Details
Name: | man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod
Namespace Prefix: | man_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition In the event the performance criteria meets the target performance level, the number of shares, up to the Target Award level, may be granted. + References No definition available. + Details
Name: | man_TargetAward
Namespace Prefix: | man_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition In the event the performance criteria falls below the target performance level, a reduced number of shares, as low as the Threshold Award level, may be granted. + References No definition available. + Details
Name: | man_ThresholdAward
Namespace Prefix: | man_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_AwardTypeAxis=man_PerformanceShares1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |