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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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