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Acquisitions and Disposition - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2024 | May 31, 2024 | Jan. 02, 2024 | Jun. 29, 2025 | Mar. 30, 2025 | Dec. 29, 2024 | Jun. 30, 2024 | Jun. 29, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 304.1 |  | $ 304.2 |  | $ 304.1 |  |  | $ 151.1
Proceeds from sale of EMEA staffing operations, net of cash disposed |  |  |  |  |  |  |  | 21.8 | $ 77.1 |  |
Gain on sale of EMEA staffing operations |  |  |  | 4.0 |  |  | $ (10.0) | 4.0 | 1.6 |  |
Other income (expense), net |  |  |  | (2.3) |  |  | (6.5) | (5.5) | (4.7) |  |
Disposal Group, Not Discontinued Operations | EMEA Staffing Operations |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  | $ 110.6 |  |  |  |  |  |  |  |
Proceeds from sale of EMEA staffing operations, net of cash disposed |  |  | $ 77.1 |  |  |  |  |  |  |  |
Other receivables |  |  |  |  |  |  | 16.8 |  | 16.8 | $ 26.9 |
Working capital and other adjustments |  |  |  |  |  |  | $ 10.1 |  | $ 10.1 |  |
Proceeds from divestiture of businesses, net of cash divested |  |  |  | 21.8 |  |  |  |  |  |  |
Disposal group, not discontinued operation, gain (loss) on disposal, including net foreign currency gain (loss) |  |  |  | 4.8 |  |  |  |  |  |  |
Gain on sale of EMEA staffing operations |  |  |  | 4.0 |  |  |  |  |  |  |
Other income (expense), net |  |  |  | 0.8 |  |  |  |  |  |  |
Children's Therapy Center (CTC) | Kelly Services USA, LLC (KSU) |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired | 100.00% |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred | $ 3.3 |  |  |  |  |  |  |  |  |  |
Total cash consideration | $ 3.1 |  |  |  |  |  |  |  |  |  |
Net working capital adjustment |  |  |  |  | $ 0.1 |  |  |  |  |  |
Goodwill |  |  |  | $ 2.9 |  |  |  | $ 2.9 |  |  |
Motion Recruitment Partners, LLC |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  | 100.00% |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  | $ 425.0 |  |  |  |  |  |  |  |  |
Total cash consideration |  | 440.0 |  |  |  |  |  |  |  |  |
Net working capital adjustment |  |  |  |  |  | 1.4 |  |  |  |  |
Additional consideration payable |  | 3.4 |  |  |  |  |  |  |  |  |
Contingent consideration, maximum |  | $ 60.0 |  |  |  |  |  |  |  |  |
Business combination, contingent consideration, liability |  |  |  |  |  | $ 0.0 |  |  |  |  |

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