Interest and Other Expenses (Income), Net - Schedule of Interest and Other Expenses (Income), Net (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Apr. 03, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Manpower Switzerland | Interest and Other Expenses (Income), Net
Other Nonoperating Income (Expense) [Line Items]
Gain on acquisition of remaining controlling interest	$ 80.4	$ 80.4	$ 80.4	$ 80.4	$ 80.4