Quarterly Data (Unaudited) (Parenthetical) (Details) - USD ($)		3 Months Ended								12 Months Ended
	Apr. 03, 2019	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Line Items]
Restructuring costs		$ 12,600,000	$ 49,900,000		$ 48,200,000			$ 39,800,000
Restructuring costs, net of tax		$ 8,700,000	$ 42,100,000		40,200,000			$ 31,400,000
Settlements					10,200,000
Pension settlement expenses, net of tax					$ 6,300,000
Defined Benefit Plan, Sponsor Location [Extensible List]					country:US
Restructuring costs per diluted share (in dollars per share)		$ (0.15)	$ (0.72)		$ (0.69)			$ (0.51)
Goodwill impairment charges			$ 0			$ 0			$ 0	$ 66,800,000	$ 64,000,000.0
Software impairment charge				$ 6,000,000.0
Software impairment charge, net of tax				$ 4,500,000
One-time loss on disposition			5,800,000
Loss on disposition of subsidiaries, net of tax			$ 5,200,000
Gain on disposition of previously held controlling interest											$ 30,400,000
Goodwill and related tax and other charges per diluted share (in dollars per share)							$ (1.26)
Goodwill and related tax charges per diluted share (in dollars per share)				$ (1.21)
Pension settlement expenses per diluted share (in dollars per share)					$ (0.11)
Software impairment charge per diluted share (in dollars per share)				$ (0.08)
Loss on disposition of subsidiaries per diluted share (in dollars per share)			$ (0.09)
Germany
Quarterly Financial Information Disclosure [Line Items]
Discrete valuation allowance			$ 12,400,000
Discrete valuation allowance per diluted share (in dollars per share)			$ (0.21)
Selling and Administrative Expenses
Quarterly Financial Information Disclosure [Line Items]
Goodwill impairment and related charges							$ 65,600,000
Goodwill impairment charges				$ 66,800,000
One-time loss on disposition										$ 5,800,000
Provision for Income Taxes
Quarterly Financial Information Disclosure [Line Items]
Goodwill impairment, related tax charges				$ 3,700,000			$ 10,300,000
Manpower Switzerland
Quarterly Financial Information Disclosure [Line Items]
Gain on disposition of previously held equity interest per diluted share (in dollars per share)							$ 1.32
Manpower Switzerland | Interest and Other Expenses (Income), Net
Quarterly Financial Information Disclosure [Line Items]
Gain on disposition of previously held equity interest	$ 80,400,000						$ 80,400,000
ManpowerGroup Greater China Limited
Quarterly Financial Information Disclosure [Line Items]
Gain on disposition of previously held controlling interest						$ 30,400,000
Gain on disposition of previously held controlling interest per diluted share (in dollars per share)						$ 0.50