Revenue - Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 1,268.3	$ 1,296.4
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,047.7	1,033.6
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	10.9	10.8
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	306.4	317.1
Science, Engineering & Technology | Americas
Disaggregation of Revenue [Line Items]
Revenue	302.1	313.8
Science, Engineering & Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	4.3	3.3
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	114.6	109.1
Outsourcing & Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue	94.1	92.3
Outsourcing & Consulting | Europe
Disaggregation of Revenue [Line Items]
Revenue	9.6	6.0
Outsourcing & Consulting | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	10.9	10.8
International
Disaggregation of Revenue [Line Items]
Revenue	211.8	252.8
International | Americas
Disaggregation of Revenue [Line Items]
Revenue	16.0	10.1
International | Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 195.8	$ 242.7