Interest and Other Expenses (Income), Net - Schedule of Interest and Other Expenses (Income), Net (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Apr. 03, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Manpower Switzerland | Interest and Other Expenses (Income), Net
Other Non Operating Income Expense [Line Items]
Non-cash gain on disposition of previously held equity interest	$ 80.4	$ 80.4		$ 80.4
United States Plans
Other Non Operating Income Expense [Line Items]
Pension settlement loss			$ (10.2)