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Revenue - Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 1,045.1	$ 1,268.3
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,022.8	1,047.7
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	11.5	10.9
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	289.3	306.4
Science, Engineering & Technology | Americas
Disaggregation of Revenue [Line Items]
Revenue	286.2	302.1
Science, Engineering & Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	3.1	4.3
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	108.0	114.6
Outsourcing & Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue	88.8	94.1
Outsourcing & Consulting | Europe
Disaggregation of Revenue [Line Items]
Revenue	7.7	9.6
Outsourcing & Consulting | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	11.5	10.9
International
Disaggregation of Revenue [Line Items]
Revenue	0.0	195.8
International | Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 0.0	$ 195.8

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