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Revenue - Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Sep. 29, 2024	Oct. 01, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 1,038.1	$ 1,118.0	$ 3,140.7	$ 3,603.5
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,012.2	891.3	3,069.2	2,925.5
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	15.8	10.9	39.8	32.9
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	405.2	295.7	1,026.7	903.5
Science, Engineering & Technology | Americas
Disaggregation of Revenue [Line Items]
Revenue	402.8	292.0	1,018.4	891.4
Science, Engineering & Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	2.4	3.7	8.3	12.1
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	121.0	114.1	346.0	342.4
Outsourcing & Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue	97.5	94.1	282.8	281.2
Outsourcing & Consulting | Europe
Disaggregation of Revenue [Line Items]
Revenue	7.7	9.1	23.4	28.3
Outsourcing & Consulting | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	15.8	10.9	39.8	32.9
International
Disaggregation of Revenue [Line Items]
Revenue	0.0	203.0	0.0	604.7
International | Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 0.0	$ 203.0	$ 0.0	$ 604.7

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