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Revenue - Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2023	Jul. 03, 2022	Jul. 02, 2023	Jul. 03, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 1,217.2	$ 1,267.3	$ 2,485.5	$ 2,563.7
Americas
Disaggregation of Revenue [Line Items]
Revenue	986.5	1,009.3	2,034.2	2,042.9
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	11.1	11.5	22.0	22.3
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	301.4	324.3	607.8	641.4
Science, Engineering & Technology | Americas
Disaggregation of Revenue [Line Items]
Revenue	297.3	320.4	599.4	634.2
Science, Engineering & Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	4.1	3.9	8.4	7.2
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	113.7	124.4	228.3	233.5
Outsourcing & Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue	93.0	107.1	187.1	199.4
Outsourcing & Consulting | Europe
Disaggregation of Revenue [Line Items]
Revenue	9.6	5.8	19.2	11.8
Outsourcing & Consulting | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	11.1	11.5	22.0	22.3
International
Disaggregation of Revenue [Line Items]
Revenue	225.1	247.6	436.9	500.4
International | Americas
Disaggregation of Revenue [Line Items]
Revenue	19.2	10.8	35.2	20.9
International | Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 205.9	$ 236.8	$ 401.7	$ 479.5

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