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Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Millions | Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
--- | --- | --- | ---
Other Assets [Line Items] |  |  |
Intangibles, net | $ 256.3 | $ 137.7 |
Noncurrent restricted cash | 6.4 | 8.0 | $ 8.6
Workers' compensation and other claims receivable | 4.9 | 11.7 |
Equity securities, FV-NI and without readily determinable fair value | 11.0 | 7.9 |
Other | 5.1 | 7.8 |
Total other assets | 45.3 | 43.1 |
Total other assets, including held-for-sale |  | 48.5 |
Intangible assets, accumulated amortization | 91.4 | 64.1 |
PersolKelly Pte. Ltd. |  |  |
Other Assets [Line Items] |  |  |
Equity securities, FV-NI and without readily determinable fair value | 6.4 |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations | European Staffing Operations |  |  |
Other Assets [Line Items] |  |  |
Total other assets |  | 5.4 |
Long Term Hosted Software, net of accumulated amortization |  |  |
Other Assets [Line Items] |  |  |
Intangibles, net | 17.9 | 13.1 |
Long Term Hosted Software, net of accumulated amortization | Other Assets |  |  |
Other Assets [Line Items] |  |  |
Intangible assets, accumulated amortization | $ 23.5 | $ 14.2 |

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