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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
Revenue from Services
Segment revenue from services	$ 1,205.9	$ 1,261.1
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(0.2)	(0.1)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	467.6	493.8
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	254.7	270.2
Education | Reporting Segments
Revenue from Services
Segment revenue from services	111.6	142.5
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	99.3	89.5
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 272.9	$ 265.2

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- 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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