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Revenue - Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 1,296.4	$ 1,205.9
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,033.6	951.4
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	10.8	8.3
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	317.1	254.7
Science, Engineering & Technology | Americas
Disaggregation of Revenue [Line Items]
Revenue	313.8	253.2
Science, Engineering & Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	3.3	1.5
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	109.1	99.3
Outsourcing & Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue	92.3	84.8
Outsourcing & Consulting | Europe
Disaggregation of Revenue [Line Items]
Revenue	6.0	6.2
Outsourcing & Consulting | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	10.8	8.3
International
Disaggregation of Revenue [Line Items]
Revenue	252.8	272.9
International | Americas
Disaggregation of Revenue [Line Items]
Revenue	10.1	34.3
International | Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 242.7	$ 238.6

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