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Revenue - Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 1,267.3	$ 1,258.1	$ 2,563.7	$ 2,464.0
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,009.3	994.1	2,042.9	1,945.5
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	11.5	9.3	22.3	17.6
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	324.3	298.2	641.4	552.9
Science, Engineering & Technology | Americas
Disaggregation of Revenue [Line Items]
Revenue	320.4	296.6	634.2	549.8
Science, Engineering & Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	3.9	1.6	7.2	3.1
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	124.4	107.3	233.5	206.6
Outsourcing & Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue	107.1	92.6	199.4	177.4
Outsourcing & Consulting | Europe
Disaggregation of Revenue [Line Items]
Revenue	5.8	5.5	11.8	11.7
Outsourcing & Consulting | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	11.5	9.2	22.3	17.5
International
Disaggregation of Revenue [Line Items]
Revenue	247.6	280.4	500.4	553.3
International | Americas
Disaggregation of Revenue [Line Items]
Revenue	10.8	32.8	20.9	67.1
International | Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 236.8	$ 247.6	$ 479.5	$ 486.2

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