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Investment in PersolKelly Pte. Ltd. - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2022 USD ($) | Apr. 03, 2022 USD ($) | Dec. 31, 2023 USD ($) | Jan. 01, 2023 USD ($) | Jan. 02, 2022 USD ($) | Feb. 14, 2022 country
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Proceeds from sale of equity method investment |  |  | $ 0.0 | $ 119.5 | $ 0.0 |
Equity in net earnings of affiliate |  | $ 0.8 | 0.0 | 0.8 | $ 5.4 |
Equity securities, FV-NI and without readily determinable fair value |  |  | $ 6.4 | $ 6.4 |  |
PersolKelly Pte. Ltd. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 49.00% | 49.00%
Number of geographies in which entity operates | country |  |  |  |  |  | 10
Equity method investment, amount sold, percentage |  |  |  |  |  | 95.00%
Proceeds from sale of equity method investment | $ 119.5 |  |  |  |  |
Equity method investment, amount sold | 117.6 |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) - liquidation of Japan subsidiary | (1.9) |  |  |  |  |
Gain on disposal | $ 1.9 |  |  |  |  |
Equity ownership, excluding consolidated entity and equity method investee, percentage |  |  | 2.50% |  |  |
Equity securities, FV-NI and without readily determinable fair value |  |  | $ 6.4 |  |  |

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