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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Revenue from Services
Segment revenue from services	$ 1,296.4	$ 1,205.9
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(0.3)	(0.2)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	444.3	467.6
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	317.1	254.7
Education | Reporting Segments
Revenue from Services
Segment revenue from services	173.4	111.6
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	109.1	99.3
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 252.8	$ 272.9

X

- 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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