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Revenue - Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 1,057.5	$ 1,217.2	$ 2,102.6	$ 2,485.5
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,034.2	986.5	2,057.0	2,034.2
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	12.5	11.1	24.0	22.0
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	332.2	301.4	621.5	607.8
Science, Engineering & Technology | Americas
Disaggregation of Revenue [Line Items]
Revenue	329.4	297.3	615.6	599.4
Science, Engineering & Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	2.8	4.1	5.9	8.4
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	117.0	113.7	225.0	228.3
Outsourcing & Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue	96.5	93.0	185.3	187.1
Outsourcing & Consulting | Europe
Disaggregation of Revenue [Line Items]
Revenue	8.0	9.6	15.7	19.2
Outsourcing & Consulting | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	12.5	11.1	24.0	22.0
International
Disaggregation of Revenue [Line Items]
Revenue	0.0	205.9	0.0	401.7
International | Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 0.0	$ 205.9	$ 0.0	$ 401.7

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