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Acquisitions and Dispositions - Additional Information (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) Business | Aug. 07, 2019 | Jul. 10, 2019 | Jul. 09, 2019 | Apr. 03, 2019 USD ($) | Dec. 31, 2018 USD ($) business_unit | Sep. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage interest acquired |  |  |  |  |  |  |  |  |  |  |  | 51.00%
Total cash consideration paid for acquisitions, net of cash acquired |  |  |  |  |  |  |  |  | $ 2,600,000 | $ 47,700,000 | $ 51,800,000 |
Business combination, net of cash acquired |  |  |  |  |  |  |  |  | 700,000 | (77,800,000) | 9,100,000 |
Total contingent consideration payments for acquisitions |  |  |  |  |  |  |  |  |  |  | 42,700,000 |
Payment for contingent consideration liability, financing activities |  |  |  |  |  |  |  |  | 1,900,000 | 13,000,000.0 | 18,600,000 |
Goodwill acquired during the period |  |  |  |  |  |  |  |  | 0 | 48,000,000.0 | 6,100,000 |
Intangible assets acquired during the period |  |  |  |  |  |  |  |  | $ 0 |  | $ 700,000 |
Non-cash gain on deconsolidation |  |  |  |  |  |  |  |  |  | 30,400,000 |  |
Number of businesses disposed | Business | 4 |  |  |  |  |  |  |  |  |  |  |
Net proceeds from disposal of businesses | $ 5,800,000 |  |  |  |  |  |  |  |  |  |  |
One-time loss on disposition |  |  |  |  |  |  | $ 5,800,000 |  |  |  |  |
ManpowerGroup Greater China Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of diluted ownership interest, description |  |  |  |  |  |  |  |  | 36.87% as the underwriters exercised their overallotment option in full |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 6,200,000 |  |
ManpowerGroup Greater China Limited | APME |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of controlling interest |  |  |  | 51.00% |  |  |  |  |  |  |  |
ManpowerGroup Greater China Limited | Initial Public Offering |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares issued in equity |  |  | 25.00% |  |  |  |  |  |  |  |  |
Percentage of diluted ownership interest |  |  | 38.25% |  |  |  |  |  |  |  |  |
Percentage of diluted ownership interest, if underwriter exercises of overallotment option in full |  | 36.87% |  |  |  |  |  |  |  |  |  |
Netherlands Business Unit | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of business units sold | business_unit |  |  |  |  |  | 1 |  |  |  |  |  |
After tax net gain |  |  |  |  |  | $ 3,800,000 |  |  |  |  |  |
Selling and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
One-time loss on disposition |  |  |  |  |  |  |  |  | $ 5,800,000 |  |  |
Selling and Administrative Expenses | ManpowerGroup Greater China Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash gain on deconsolidation |  |  |  |  |  |  |  |  |  | 30,400,000 |  |
Manpower Switzerland |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage interest acquired |  |  |  |  | 51.00% |  |  |  |  |  |  |
Cash consideration for acquisitions |  |  |  |  | $ 219,500,000 |  |  |  |  |  |  |
Acquired interests |  |  |  |  | 58,300,000 |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 161,200,000 |  |  |  |  |  |  |
Total cash impact of the acquisition |  |  |  |  | 98,000,000.0 |  |  |  |  |  |  |
Cash acquired |  |  |  |  | 317,500,000 |  |  |  |  |  |  |
Reclassification of foreign currency translation adjustments related to previously held equity interest |  |  |  |  | 32,500,000 |  |  |  |  | 32,500,000 |  |
Manpower Switzerland | Interest and Other Expenses (Income), Net |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash gain on disposition of previously held equity interest |  |  |  |  | $ 80,400,000 |  |  | $ 80,400,000 |  |  |  |
Experis AG |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage interest acquired |  |  |  |  | 20.00% |  |  |  |  |  |  |
2019 Acquisitions Excluding Manpower Switzerland |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired during the period |  |  |  |  |  |  |  |  |  | 14,200,000 |  |
Intangible assets acquired during the period |  |  |  |  |  |  |  |  |  | $ 9,000,000.0 |  |

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