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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