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Acquisitions - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 03, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration for acquisitions |  |  |  |  | $ 47.4
Business combination, net of cash acquired |  |  |  | $ (114.7) | 8.2
Reclassification of foreign currency translation adjustments related to previously held equity interest |  | $ (32.5) |  | (32.5) |
Net revenues from services since the acquisition | $ 111.0 |  |  |  |
Payment for contingent consideration liability, financing activities |  |  |  | $ 13.0 | 15.1
Payments of contingent consideration for acquisitions |  |  |  |  | 39.2
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 | $ 212.7 |  |  |  |
Acquired interests | 58.3 |  |  |  |
Cash and cash equivalents | 154.4 |  |  |  |
Aggregate of consideration paid and fair value of previously held equity interest | 408.3 |  |  |  |
Business combination, net of cash acquired | 90.8 |  |  |  |
Reclassification of foreign currency translation adjustments related to previously held equity interest | 32.5 |  |  |  |
Manpower Switzerland | Interest and Other (Income) Expenses, 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 |  |  |  | $ 17.7 |

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