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Acquisitions and Dispositions - Additional Information (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 07, 2019 | Jul. 10, 2019 | Jul. 09, 2019 | Apr. 03, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration for acquisitions |  |  |  |  |  |  |  | $ 50.9
Business combination, net of cash acquired |  |  |  |  |  |  | $ (86.1) | 8.2
Net revenues from services since the acquisition |  |  |  | $ 227.8 |  |  |  |
Payment for contingent consideration liability, financing activities |  |  |  | $ 13.0 |  |  |  | 18.6
Payments of contingent consideration for acquisitions |  |  |  |  |  |  |  | 42.7
Non-cash gain on deconsolidation |  |  |  |  |  |  | $ 30.4 |
Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible asset amortized useful life |  |  |  |  |  |  | 15 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 |  |  |  |
Settlements of net debt and net working capital adjustments |  |  |  |  | $ 6.8 |  |  |
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 |
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% |  |  |  |
Excluding Manpower Switzerland and Experis AG |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business combination, net of cash acquired |  |  |  |  |  |  | 39.5 |
ManpowerGroup Greater China Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Reclassification of foreign currency translation adjustments related to previously held equity interest |  |  |  |  | (6.2) |  | (6.2) |
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% |  |  |  |  |  |  |
Percentage of diluted ownership interest, description |  |  |  |  |  |  | 36.87% as the underwriters exercised their overallotment option in full |
ManpowerGroup Greater China Limited | Selling and Administrative Expenses |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Non-cash gain on deconsolidation |  |  |  |  | $ 30.4 |  | $ 30.4 |

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