Acquisitions and Dispositions - Additional Information (Details) $ in Millions						3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) Business	Aug. 07, 2019	Jul. 10, 2019	Jul. 09, 2019	Apr. 03, 2019 USD ($)	Sep. 30, 2020 USD ($) Business	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Business	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Total cash consideration paid for acquisitions, net of cash acquired								$ 1.7	$ (86.1)
Number of businesses disposed | Business	4					4		4
Net proceeds from disposal of businesses	$ 5.8
Reclassification of foreign currency translation adjustments related to previously held equity interest							$ (6.2)		26.3
Total contingent consideration payments for acquisitions								$ 13.0
Manpower Switzerland
Business Acquisition [Line Items]
Total cash consideration paid for acquisitions, net of cash acquired					$ 317.5
Percentage interest acquired					51.00%
Cash consideration for acquisitions									219.5
Acquired interests					$ 58.3
Cash and cash equivalents					161.2
Total cash impact of the acquisition					98.0
Post-closing settlement of net debt and net working capital settlement					6.8
Payment of post-closing settlement of net debt and net working capital adjustments							6.8
Reclassification of foreign currency translation adjustments related to previously held equity interest					$ 32.5
Experis AG
Business Acquisition [Line Items]
Percentage interest acquired					20.00%
Excluding Manpower Switzerland and Experis AG
Business Acquisition [Line Items]
Total cash consideration paid for acquisitions, net of cash acquired									39.5
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							6.2
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%
Selling and Administrative Expenses
Business Acquisition [Line Items]
One-time loss on disposition						$ 5.8		$ 5.8
Selling and Administrative Expenses | ManpowerGroup Greater China Limited
Business Acquisition [Line Items]
Cash gain on deconsolidation							$ 30.4
Interest and Other Expenses (Income), Net | Manpower Switzerland
Business Acquisition [Line Items]
Non-cash gain on disposition of previously held equity interest					$ 80.4				$ 80.4