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Other Income (Expense), Net - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Oct. 01, 2023 | Oct. 02, 2022
Other Income (Expense) [Line Items] |  |
Proceeds from equity securities | $ 2.0 | $ 0.0
Brazil |  |
Other Income (Expense) [Line Items] |  |
Increase to indemnification liability |  | 0.8
Business Talent Group, LLC |  |
Other Income (Expense) [Line Items] |  |
Proceeds from equity securities | $ 2.0 |
Kelly Services Japan, Inc. |  |
Other Income (Expense) [Line Items] |  |
Unrealized gain (loss), foreign currency transaction, after tax |  | $ 5.5

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