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Share-Based Compensation Plans - Performance Share Units (Details) - Performance Shares - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Payout Levels (in units): |  |  |  |
Threshold Award (in shares) | 59,698 | 61,381 | 42,361 | 57,563
Target Award (in shares) | 119,395 | 122,761 | 84,726 | 115,125
Outstanding Award (in shares) | 238,790 | 245,522 | 169,452 | 230,250
Shares Issued (in shares) |  |  |  | 88,807
Payout Achieved Over Performance Period |  |  | 42,361 |

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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: |