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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax [Line Items] |  |  |
Income tax based on statutory rate | $ 31.0 | $ 143.9 | $ 158.5
Increase (decrease) resulting from: |  |  |
Repatriation of non-United States earnings | (2.0) | (17.8) | 2.5
State income taxes, net of federal benefit | (1.3) | 3.1 | 8.2
Change in valuation allowance | 48.5 | 20.0 | 0.7
Work Opportunity Tax Credit | (4.9) | (10.4) | (8.8)
Foreign-Derived Intangible Income deduction | (8.8) | (11.9) | (12.5)
United States Tax Act and French tax reform |  |  | 3.2
Goodwill impairment | 13.4 | 11.9 |
Other, net | (5.4) | 11.6 | 7.0
Total provision | 123.9 | 219.8 | 198.0
Manpower Switzerland and Greater China |  |  |
Increase (decrease) resulting from: |  |  |
Gain related to Manpower Switzerland and Greater China transactions |  | (22.8) |
French Business Tax |  |  |
Increase (decrease) resulting from: |  |  |
Non-United States tax rate difference: | 43.7 | 54.9 | 59.1
French CICE |  |  |
Increase (decrease) resulting from: |  |  |
Non-United States tax rate difference: |  |  | (39.9)
Other |  |  |
Increase (decrease) resulting from: |  |  |
Non-United States tax rate difference: | $ 9.7 | $ 37.3 | $ 20.0

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