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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Revenue from Services
Segment revenue from services	$ 1,267.3	$ 1,258.1	$ 2,563.7	$ 2,464.0
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(0.3)	(0.2)	(0.6)	(0.4)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	415.8	466.5	860.1	934.1
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	324.3	298.2	641.4	552.9
Education | Reporting Segments
Revenue from Services
Segment revenue from services	155.5	105.9	328.9	217.5
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	124.4	107.3	233.5	206.6
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 247.6	$ 280.4	$ 500.4	$ 553.3

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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