Fair Value Measurements - Narrative (Details) € in Millions, $ in Millions		2 Months Ended	3 Months Ended				12 Months Ended
	Jan. 05, 2024 USD ($)	Jan. 05, 2024 USD ($)	Dec. 29, 2024 USD ($)	Mar. 31, 2024 USD ($)	Apr. 02, 2023 USD ($)	Apr. 03, 2022 USD ($)	Dec. 29, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jan. 01, 2023 USD ($)	Jul. 17, 2024 USD ($) derivative	May 31, 2024 USD ($)	Feb. 08, 2024 EUR (€)	Nov. 02, 2023 EUR (€)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on forward contract								$ 3.6
Gain (loss) on forward contract							$ 1.2	(3.6)	$ 0.0
Disposition, increase (decrease) in indemnification liabilities							(0.7)
Payment for contingent consideration liability, financing activities							0.0	2.5	3.3
Equity securities, FV-NI and without readily determinable fair value			$ 11.0				11.0	7.9
PersolKelly Pte. Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, FV-NI and without readily determinable fair value			$ 6.4				$ 6.4	6.4
PersolKelly Pte. Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity ownership, excluding consolidated entity and equity method investee, percentage			2.50%				2.50%
Motion Recruitment Partners, LLC (MRP)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability			$ 0.0				$ 0.0
Possible future contingent consideration											$ 60.0
Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment for contingent consideration liability, financing activities						$ 0.7		1.4
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, FV-NI and without readily determinable fair value			3.5				3.5		0.4
Disposal group, including discontinued operation, investment			0.1				0.1
Gain (loss) on sale of investments			0.6
Equity securities, FV-NI, unrealized gain			3.2
Level 3 | Motion Recruitment Partners, LLC (MRP)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability			0.0				0.0				$ 3.4
Possible future contingent consideration			60.0				60.0
Level 3 | Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability								0.0	$ 3.3
Payment for contingent consideration liability					$ 3.3	$ 2.3
Level 3 | Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, indemnification liabilities								3.0
Total Europe Region | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, increase (decrease) in indemnification liabilities							(0.1)
Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, increase (decrease) in indemnification liabilities			(0.7)				(0.7)
Brazil | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, indemnification liabilities			8.8				8.8
Measured on a recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds			6.4				6.4	42.5
Measured on a recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds			0.0				0.0	0.0
Measured on a recurring basis | Total Europe Region
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification			(2.0)				(2.0)
Measured on a recurring basis | Total Europe Region | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification			(2.0)				(2.0)
Measured on a recurring basis | Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification			(1.7)				(1.7)	(3.0)
Measured on a recurring basis | Brazil | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification			(1.7)				(1.7)	(3.0)
Foreign currency forward contract, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount | €												€ 17.0	€ 90.0
Payments for derivative instrument, investing activities	$ 2.4		0.4
Derivative, gain (loss) on derivative, net			(0.4)
Derivative asset			0.0				0.0
Derivative liability			0.0				0.0	3.6
Gain (loss) on forward contract								(3.6)
Derivative instruments not designated as hedging instruments, gain				$ 1.2
Derivative instruments not designated as hedging instruments, loss		$ 2.4
Foreign currency forward contract, net | Measured on a recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability								(3.6)
Foreign currency forward contract, net | Measured on a recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability								0.0
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount										$ 50.0
Derivative instruments not designated as hedging instruments, loss							0.4
Number of interest rate swaps | derivative										2
Gain (loss) on forward contract							(0.2)
Proceeds from derivative instrument, financing activities							0.2
Interest Rate Swap | Measured on a recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability			(0.4)				(0.4)
Interest Rate Swap | Measured on a recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability			0.0				0.0
Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds			6.4				6.4	8.0
Accounts Payable and Accrued Liabilities | Brazil | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, indemnification liabilities			0.9				0.9	0.1
Other Long Term Liabilities | Brazil | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, indemnification liabilities			$ 0.8				$ 0.8	$ 2.9