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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax [Line Items] |  |  |  |
Income tax based on statutory rate |  | $ 143.9 | $ 158.5 | $ 258.1
Increase (decrease) resulting from: |  |  |  |
Repatriation of non-United States earnings |  | (17.8) | 2.5 | 69.7
State income taxes, net of federal benefit |  | 3.1 | 8.2 | 1.1
Change in valuation allowance |  | 20.0 | 0.7 | (6.9)
Work Opportunity Tax Credit |  | (10.4) | (8.8) | (10.5)
Foreign-Derived Intangible Income deduction |  | (11.9) | (12.5) |
United States Tax Act and French tax reform | $ (73.7) |  | 3.2 | (73.7)
Goodwill impairment |  | 11.9 |  |
Other, net |  | 11.6 | 7.0 | 12.9
Total provision |  | 219.8 | 198.0 | 191.9
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: |  | 54.9 | 59.1 | 46.9
French CICE |  |  |  |
Increase (decrease) resulting from: |  |  |  |
Non-United States tax rate difference: |  |  | (39.9) | (77.1)
Other |  |  |  |
Increase (decrease) resulting from: |  |  |  |
Non-United States tax rate difference: |  | $ 37.3 | $ 20.0 | $ (28.6)

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