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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
Revenue from Services
Segment revenue from services	$ 1,057.5	$ 1,217.2	$ 2,102.6	$ 2,485.5
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(0.5)	(1.0)	(1.0)	(1.5)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	357.7	390.8	716.1	793.4
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	332.2	301.4	621.5	607.8
Education | Reporting Segments
Revenue from Services
Segment revenue from services	251.1	206.4	541.0	455.8
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	117.0	113.7	225.0	228.3
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 0.0	$ 205.9	$ 0.0	$ 401.7

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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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