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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) | $ 0.9 | $ 12.7 | $ (35.3) | $ 19.1
Outside basis difference | (7.7) |  |  |
Increase (decrease) in valuation allowance |  | (10.4) |  |
Persol Holdings |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) | $ 9.1 | $ 18.7 | (14.8) | $ 22.8
Goodwill |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) |  |  | $ (23.0) |

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