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Quarterly Data (Unaudited) (Parenthetical) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 03, 2019
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Line Items]                
Defined Benefit Plan, Sponsor Location [Extensible List]       United States        
Goodwill impairment charges   $ 0 $ 0   $ 0 $ 0 $ 66,800,000 $ 64,000,000.0
Gain on disposition of previously held controlling interest           $ 0 0 $ 30,400,000
Selling and Administrative Expenses                
Quarterly Financial Information Disclosure [Line Items]                
One-time loss on disposition             $ (5,800,000)  
Manpower Switzerland | Interest and Other Expenses (Income), Net                
Quarterly Financial Information Disclosure [Line Items]                
Business Combination Non Cash Gain On Disposition Of Previously Held Equity Interest $ 80,400,000