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Segment Disclosures - Business Unit Profit (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 29, 2024	Jun. 30, 2024	Oct. 01, 2023	Jul. 02, 2023	Sep. 29, 2024	Oct. 01, 2023
Earnings (loss) from Operations
Gross profit	$ 221.7		$ 228.5		$ 641.1	$ 723.2
Asset impairment charge		$ (5.5)		$ (2.4)
Earnings (loss) from operations	2.6		0.1		41.6	17.0
Asset impairment charge	0.0		0.0		(5.5)	(2.4)
Gain on sale of EMEA staffing operations	0.0		0.0		1.6	0.0
Depreciation and amortization	(14.5)		(10.0)		(37.2)	(29.7)
Gain on forward contract	0.0		0.0		1.2	0.0
Other income (expense), net	(4.4)		1.6		(9.1)	3.0
Earnings before taxes	(1.8)		1.7		33.7	20.0
Corporate
Earnings (loss) from Operations
Earnings (loss) from operations	(17.0)		(16.7)		(44.4)	(42.6)
Asset impairment charge	0.0		0.0		(5.5)	0.0
(Loss) gain on sale of assets	(0.1)		0.0		5.4	0.0
Professional & Industrial
Earnings (loss) from Operations
Depreciation and amortization	(2.5)		(2.0)		(7.6)	(5.9)
Professional & Industrial | Reporting Segments
Earnings (loss) from Operations
Gross profit	66.5		69.1		192.7	209.8
SG&A expenses, excluding depreciation and amortization	(56.3)		(63.4)		(169.7)	(201.8)
Asset impairment charge	0.0		0.0		0.0	(0.3)
Business unit profit (loss)	10.2		5.7		23.0	7.7
Science, Engineering & Technology
Earnings (loss) from Operations
Depreciation and amortization	(8.1)		(4.0)		(18.0)	(11.9)
Science, Engineering & Technology | Reporting Segments
Earnings (loss) from Operations
Gross profit	99.1		68.0		240.8	207.4
SG&A expenses, excluding depreciation and amortization	(74.1)		(47.3)		(173.1)	(150.2)
Asset impairment charge	0.0		0.0		0.0	(0.1)
Business unit profit (loss)	25.0		20.7		67.7	57.1
Education
Earnings (loss) from Operations
Depreciation and amortization	(2.1)		(2.0)		(6.2)	(5.8)
Education | Reporting Segments
Earnings (loss) from Operations
Gross profit	19.7		19.8		98.7	91.6
SG&A expenses, excluding depreciation and amortization	(23.0)		(22.3)		(71.2)	(69.4)
Business unit profit (loss)	(3.3)		(2.5)		27.5	22.2
Outsourcing & Consulting
Earnings (loss) from Operations
Depreciation and amortization	(1.8)		(1.4)		(5.4)	(4.3)
Outsourcing & Consulting | Reporting Segments
Earnings (loss) from Operations
Gross profit	36.4		41.5		108.9	124.4
SG&A expenses, excluding depreciation and amortization	(34.1)		(40.0)		(105.4)	(120.8)
Asset impairment charge	0.0		0.0		0.0	(2.0)
Business unit profit (loss)	2.3		1.5		3.5	1.6
International
Earnings (loss) from Operations
Depreciation and amortization	0.0		(0.6)		0.0	(1.8)
International | Reporting Segments
Earnings (loss) from Operations
Gross profit	0.0		30.1		0.0	90.0
SG&A expenses, excluding depreciation and amortization	0.0		(28.7)		0.0	(89.3)
Business unit profit (loss)	$ 0.0		$ 1.4		$ 0.0	$ 0.7

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