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Quarterly Data (Unaudited) (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 03, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  | $ 39.8 | $ 15.3 | $ 24.0 |  |  |
Restructuring costs, net of tax |  |  |  | $ 31.4 | $ 11.8 | $ 18.1 |  |  |
Restructuring costs per diluted share (in dollars per share) |  |  |  | $ (0.51) | $ (0.18) | $ (0.27) |  |  |
Gain on disposition of previously held controlling interest |  |  |  |  |  |  | $ 30.4 |  |
Goodwill and related tax and other charges per diluted share (in dollars per share) |  |  | $ (1.26) |  |  |  |  |  |
Selling and Administrative Expenses |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment and related charges |  |  | $ 65.6 |  |  |  |  |  |
Provision for Income Taxes |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment, related tax charges |  |  | $ 10.3 |  |  |  |  |  |
Manpower Switzerland |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Gain on disposition of previously held equity interest per diluted share (in dollars per share) |  |  | $ 1.32 |  |  |  |  |  |
Manpower Switzerland | Interest and Other Expenses (Income), Net |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Gain on disposition of previously held equity interest | $ 80.4 |  | $ 80.4 |  |  |  | 80.4 | $ 80.4 | $ 80.4
ManpowerGroup Greater China Limited |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Gain on disposition of previously held controlling interest |  | $ 30.4 |  |  |  |  |  |  |
Gain on disposition of previously held controlling interest per diluted share (in dollars per share) |  | $ 0.50 |  |  |  |  |  |  |
ManpowerGroup Greater China Limited | Selling and Administrative Expenses |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Gain on disposition of previously held controlling interest |  |  |  |  |  |  | $ 30.4 |  |

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