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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component, Net of Tax (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 01, 2022 | Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of year |  | $ 1,253.7 | $ 1,254.2 |
Balance at end of year |  | 1,234.6 | 1,253.7 | $ 1,254.2
Other Expense |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  | (1.4)
Gain (Loss) on Disposal of Assets |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  | 1.4
PersolKelly Pte. Ltd. |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | $ 1.9 |  |  |
Foreign currency translation adjustments: |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of year |  | 0.6 | (7.4) | (25.0)
Other comprehensive income (loss) before classifications |  | (6.9) | 8.0 | (7.5)
Net current-period other comprehensive income (loss) |  | (7.5) | 8.0 | 17.6
Balance at end of year |  | (6.9) | 0.6 | (7.4)
Foreign currency translation adjustments: | Liquidation of Subsidiary |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  | 0.0 | 0.0 | 20.4
Foreign currency translation adjustments: | Equity Method Investment |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  | (0.6) | 0.0 | 4.7
Foreign currency translation adjustments: | PersolKelly Pte. Ltd. | Other Expense |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  | (1.9)
Pension liability adjustments: |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of year |  | (0.4) | (1.1) | (2.7)
Other comprehensive income (loss) before classifications |  | 0.0 | 0.6 | 1.5
Amounts reclassified from accumulated other comprehensive income (loss) |  | 0.4 | 0.1 | 0.1
Net current-period other comprehensive income (loss) |  | 0.4 | 0.7 | 1.6
Balance at end of year |  | 0.0 | (0.4) | (1.1)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of year |  | 0.2 | (8.5) | (27.7)
Balance at end of year |  | $ (6.9) | $ 0.2 | $ (8.5)

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