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Acquisitions and Dispositions - Additional Information (Details) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 07, 2019 | Jul. 10, 2019 | Jul. 09, 2019 | Apr. 03, 2019 USD ($) | Dec. 31, 2018 USD ($) business_unit | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage interest acquired |  |  |  |  |  |  |  |  |  |  | 51.00%
Business combination, net of cash acquired |  |  |  |  |  |  |  | $ (77.8) | $ 9.1 | $ 32.7 |
Intangible assets |  |  |  |  | $ 246.3 |  |  | 268.6 | 246.3 |  |
Goodwill |  |  |  |  | $ 1,297.1 |  |  | 1,260.1 | 1,297.1 | 1,343.0 |
Net revenues from services since the acquisition |  |  |  |  |  |  |  | 337.7 |  |  |
Total cash consideration paid for acquisitions, net of cash acquired |  |  |  |  |  |  |  | 47.7 | 51.8 | 45.7 |
Total contingent consideration payments for acquisitions |  |  |  |  |  |  |  |  | 42.7 |  |
Payment for contingent consideration liability, financing activities |  |  |  |  |  |  |  | 13.0 | 18.6 | 13.0 |
Goodwill acquired during the period |  |  |  |  |  |  |  | 48.0 | 6.1 |  |
Intangible assets acquired during the period |  |  |  |  |  |  |  |  | 0.7 |  |
Non-cash gain on deconsolidation |  |  |  |  |  |  |  | $ 30.4 |  |  |
Disposed of by Sale | Netherlands Business Unit |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of business units sold | business_unit |  |  |  |  | 1 |  |  |  |  |  |
After tax net gain |  |  |  |  | $ 3.8 |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible asset amortized useful life |  |  |  |  |  |  |  | 14 years |  |  |
Manpower Switzerland |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage interest acquired |  |  |  | 51.00% |  |  |  |  |  |  |
Cash consideration for acquisitions |  |  |  | $ 219.5 |  |  |  |  |  |  |
Acquired interests |  |  |  | 58.3 |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 161.2 |  |  |  |  |  |  |
Aggregate of consideration paid and fair value of previously held equity interest |  |  |  | 415.1 |  |  |  |  |  |  |
Business combination, net of cash acquired |  |  |  | 97.6 |  |  |  |  |  |  |
Reclassification of foreign currency translation adjustments related to previously held equity interest |  |  |  | 32.5 |  |  |  | $ 32.5 |  |  |
Intangible assets |  |  |  |  |  |  |  | 44.5 |  |  |
Goodwill |  |  |  |  |  |  |  | $ 34.2 |  |  |
Manpower Switzerland | Customer relationships |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible asset amortized useful life |  |  |  |  |  |  |  | 15 years |  |  |
Manpower Switzerland | Interest and Other Expenses (Income), Net |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-cash gain on disposition of previously held equity interest |  |  |  | $ 80.4 |  |  | $ 80.4 | $ 80.4 | $ 80.4 | 80.4 |
Experis AG |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage interest acquired |  |  |  | 20.00% |  |  |  |  |  |  |
7S |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment for contingent consideration liability, financing activities |  |  |  |  |  |  |  |  |  | $ 10.3 |
2019 Acquisitions Excluding Manpower Switzerland |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired during the period |  |  |  |  |  |  |  | 14.2 |  |  |
Intangible assets acquired during the period |  |  |  |  |  |  |  | 9.0 |  |  |
ManpowerGroup Greater China Limited |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reclassification of foreign currency translation adjustments related to previously held equity interest |  |  |  |  |  |  |  | $ (6.2) |  |  |
Percentage of diluted ownership interest, description |  |  |  |  |  |  |  | 36.87% as the underwriters exercised their overallotment option in full |  |  |
Non-cash gain on deconsolidation |  |  |  |  |  | $ 30.4 |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  | $ 6.2 |  |  |
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% |  |  |  |  |  |  |  |  |  |
ManpowerGroup Greater China Limited | Selling and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-cash gain on deconsolidation |  |  |  |  |  |  |  | $ 30.4 |  |  |

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