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Quarterly Data (Unaudited) (Parenthetical) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 03, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  | $ 12,600,000 | $ 49,900,000 |  | $ 48,200,000 |  |  | $ 39,800,000 |  |  |
Restructuring costs, net of tax |  | $ 8,700,000 | $ 42,100,000 |  | 40,200,000 |  |  | $ 31,400,000 |  |  |
Settlements |  |  |  |  | 10,200,000 |  |  |  |  |  |
Pension settlement expenses, net of tax |  |  |  |  | $ 6,300,000 |  |  |  |  |  |
Defined Benefit Plan, Sponsor Location [Extensible List] |  |  |  |  | country:US |  |  |  |  |  |
Restructuring costs per diluted share (in dollars per share) |  | $ (0.15) | $ (0.72) |  | $ (0.69) |  |  | $ (0.51) |  |  |
Goodwill impairment charges |  |  | $ 0 |  |  | $ 0 |  |  | $ 0 | $ 66,800,000 | $ 64,000,000.0
Software impairment charge |  |  |  | $ 6,000,000.0 |  |  |  |  |  |  |
Software impairment charge, net of tax |  |  |  | $ 4,500,000 |  |  |  |  |  |  |
One-time loss on disposition |  |  | 5,800,000 |  |  |  |  |  |  |  |
Loss on disposition of subsidiaries, net of tax |  |  | $ 5,200,000 |  |  |  |  |  |  |  |
Gain on disposition of previously held controlling interest |  |  |  |  |  |  |  |  |  |  | $ 30,400,000
Goodwill and related tax and other charges per diluted share (in dollars per share) |  |  |  |  |  |  | $ (1.26) |  |  |  |
Goodwill and related tax charges per diluted share (in dollars per share) |  |  |  | $ (1.21) |  |  |  |  |  |  |
Pension settlement expenses per diluted share (in dollars per share) |  |  |  |  | $ (0.11) |  |  |  |  |  |
Software impairment charge per diluted share (in dollars per share) |  |  |  | $ (0.08) |  |  |  |  |  |  |
Loss on disposition of subsidiaries per diluted share (in dollars per share) |  |  | $ (0.09) |  |  |  |  |  |  |  |
Germany |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discrete valuation allowance |  |  | $ 12,400,000 |  |  |  |  |  |  |  |
Discrete valuation allowance per diluted share (in dollars per share) |  |  | $ (0.21) |  |  |  |  |  |  |  |
Selling and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment and related charges |  |  |  |  |  |  | $ 65,600,000 |  |  |  |
Goodwill impairment charges |  |  |  | $ 66,800,000 |  |  |  |  |  |  |
One-time loss on disposition |  |  |  |  |  |  |  |  |  | $ 5,800,000 |
Provision for Income Taxes |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment, related tax charges |  |  |  | $ 3,700,000 |  |  | $ 10,300,000 |  |  |  |
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 | $ 80,400,000 |  |  |  |  |  | $ 80,400,000 |  |  |  |
ManpowerGroup Greater China Limited |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of previously held controlling interest |  |  |  |  |  | $ 30,400,000 |  |  |  |  |
Gain on disposition of previously held controlling interest per diluted share (in dollars per share) |  |  |  |  |  | $ 0.50 |  |  |  |  |

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