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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Revenue from Services
Segment revenue from services	$ 1,038.1	$ 1,118.0	$ 3,140.7	$ 3,603.5
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(0.6)	(0.9)	(1.6)	(2.4)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	370.4	378.0	1,086.5	1,171.4
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	405.2	295.7	1,026.7	903.5
Education | Reporting Segments
Revenue from Services
Segment revenue from services	142.1	128.1	683.1	583.9
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	121.0	114.1	346.0	342.4
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 0.0	$ 203.0	$ 0.0	$ 604.7

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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