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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
Revenue from Services
Segment revenue from services	$ 1,167.9	$ 1,195.4	$ 3,731.6	$ 3,659.4
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(0.3)	(0.2)	(0.9)	(0.6)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	408.6	452.6	1,268.7	1,386.7
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	321.3	306.2	962.7	859.1
Education | Reporting Segments
Revenue from Services
Segment revenue from services	104.3	66.6	433.2	284.1
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	118.5	113.4	352.0	320.0
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 215.5	$ 256.8	$ 715.9	$ 810.1

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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