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Fair Value Measurements - Narrative (Details) € in Millions, $ in Millions |  |  | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 17, 2024 USD ($) derivative | Jan. 05, 2024 USD ($) | Jan. 05, 2024 USD ($) | Jun. 29, 2025 USD ($) | Mar. 30, 2025 USD ($) | Dec. 29, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 29, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | May 31, 2024 USD ($) | Feb. 08, 2024 EUR (€) | Nov. 02, 2023 EUR (€) | Jan. 01, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on forward contract |  |  |  |  |  |  | $ 0.0 |  |  | $ 1.2 |  |  |  |  |
Unrealized gain (loss) on derivatives |  |  |  |  |  |  |  |  |  |  | $ (3.6) |  |  |  |
Payments for derivative instrument, investing activities |  |  |  |  |  |  |  |  | $ 0.0 | 2.4 |  |  |  |  |
Gain on forward contract |  |  |  | $ 0.0 |  |  | 0.0 |  | 0.0 | 1.2 |  |  |  |  |
Equity Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities without readily determinable fair value, with changes in fair value in net income |  |  |  | 3.5 |  | $ 3.5 |  |  | 3.5 |  |  |  |  |  | $ 0.4
Foreign Exchange Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | € |  |  |  |  |  |  |  |  |  |  |  |  | € 17.0 | € 90.0 |
Payments for derivative instrument, financing activities |  |  |  |  |  | 0.4 |  |  |  |  |  |  |  |  |
Gain on forward contract |  |  |  |  |  | (0.4) |  |  |  |  |  |  |  |  |
Foreign currency forward contract, liability, net |  |  |  |  |  | 0.0 |  |  |  |  |  |  |  |  |
Foreign currency forward contract, net |  |  |  |  |  | 0.0 |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivatives |  |  |  |  |  |  |  |  |  |  | $ (3.6) |  |  |  |
Payments for derivative instrument, investing activities |  | $ 2.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on forward contract |  |  |  |  |  |  |  | $ 1.2 |  |  |  |  |  |  |
Derivative instruments not designated as hedging instruments, loss |  |  | $ 2.4 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | $ 50.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate swaps | derivative | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swap | Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contract, liability, net |  |  |  | 0.1 |  | 0.4 |  |  | 0.1 |  |  |  |  |  |
Interest Rate Swap | Measured on Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contract, liability, net |  |  |  | 0.1 |  | 0.4 |  |  | 0.1 |  |  |  |  |  |
Interest Rate Swap, Contract One | Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | $ 50.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, term of contract | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
EMEA | Measured on Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification |  |  |  | 2.2 |  | 2.0 |  |  | 2.2 |  |  |  |  |  |
Brazil | Measured on Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification |  |  |  | 0.9 |  | 1.7 |  |  | 0.9 |  |  |  |  |  |
Brazil | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification liability |  |  |  | 8.8 |  |  |  |  | 8.8 |  |  |  |  |  |
Motion Recruitment Partners, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, contingent consideration, liability |  |  |  |  |  | 0.0 |  |  |  |  |  |  |  |  |
Contingent consideration, maximum |  |  |  |  |  |  |  |  |  |  |  | $ 60.0 |  |  |
PersolKelly Pte. Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities without readily determinable fair value, with changes in fair value in net income |  |  |  |  |  | 6.4 |  |  |  |  |  |  |  |  |
Equity ownership, excluding consolidated entity and equity method investee, percentage |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |
Proceeds from derivative instrument, financing activities |  |  |  |  | $ 6.4 |  |  |  |  |  |  |  |  |  |
Level 3 | Interest Rate Swap | Measured on Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contract, liability, net |  |  |  | 0.0 |  | 0.0 |  |  | 0.0 |  |  |  |  |  |
Level 3 | EMEA | Measured on Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification |  |  |  | 2.2 |  | 2.0 |  |  | 2.2 |  |  |  |  |  |
Level 3 | Brazil | Measured on Recurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification |  |  |  | 0.9 |  | 1.7 |  |  | 0.9 |  |  |  |  |  |
Level 3 | Motion Recruitment Partners, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, contingent consideration, liability |  |  |  |  |  | 0.0 | $ 3.4 |  |  | $ 3.4 |  |  |  |  |
Contingent consideration, maximum |  |  |  | $ 60.0 |  |  |  |  | $ 60.0 |  |  |  |  |  |
Level 3 | Accounts Payable and Accrued Liabilities | Brazil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification liability |  |  |  |  |  | 0.9 |  |  |  |  |  |  |  |  |
Level 3 | Other Long Term Liabilities | Brazil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indemnification liability |  |  |  |  |  | $ 0.8 |  |  |  |  |  |  |  |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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