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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax [Line Items]
Income tax based on statutory rate	$ 119.3	$ 31.0	$ 143.9
Increase (decrease) resulting from:
Repatriation of non-United States earnings	5.7	(2.0)	(17.8)
State income taxes, net of federal benefit	5.0	(1.3)	3.1
Change in valuation allowance	22.0	48.5	20.0
Work Opportunity Tax Credit	(10.9)	(4.9)	(10.4)
Foreign-Derived Intangible Income deduction	(10.7)	(8.8)	(11.9)
Goodwill impairment		13.4	11.9
Other, net	6.4	(5.4)	11.6
Total provision	185.7	123.9	219.8
Manpower Switzerland and Greater China
Increase (decrease) resulting from:
Gain related to Manpower Switzerland and Greater China transactions			(22.8)
French Business Tax
Increase (decrease) resulting from:
Non-United States tax rate difference:	26.7	43.7	54.9
Other
Increase (decrease) resulting from:
Non-United States tax rate difference:	$ 22.2	$ 9.7	$ 37.3

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