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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

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