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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Revenue from Services
Segment revenue from services	$ 1,258.1	$ 975.3	$ 2,464.0	$ 2,236.4
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(0.2)	(0.1)	(0.4)	(0.2)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	466.5	406.4	934.1	900.2
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	298.2	247.3	552.9	517.5
Education | Reporting Segments
Revenue from Services
Segment revenue from services	105.9	25.1	217.5	167.6
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	107.3	83.6	206.6	173.1
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 280.4	$ 213.0	$ 553.3	$ 478.2

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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