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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Revenue from Services
Segment revenue from services	$ 1,038.2	$ 1,267.7	$ 3,274.6	$ 4,017.8
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(0.1)	(0.4)	(0.3)	(0.4)
Professional & Industrial | Reporting Segments
Revenue from Services
Segment revenue from services	446.5	538.0	1,346.7	1,668.7
Science, Engineering & Technology | Reporting Segments
Revenue from Services
Segment revenue from services	244.0	285.2	761.5	859.7
Education | Reporting Segments
Revenue from Services
Segment revenue from services	27.5	57.1	195.1	313.9
Outsourcing & Consulting | Reporting Segments
Revenue from Services
Segment revenue from services	87.9	94.4	261.0	282.3
International | Reporting Segments
Revenue from Services
Segment revenue from services	$ 232.4	$ 293.4	$ 710.6	$ 893.6

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