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Revenue - Disaggregation of Revenues by Service Type (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
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	358.4	402.6
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	289.3	306.4
Education
Disaggregation of Revenue [Line Items]
Revenue	289.9	249.4
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	108.0	114.6
International
Disaggregation of Revenue [Line Items]
Revenue	0.0	195.8
Staffing services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	231.2	268.6
Staffing services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	195.2	202.3
Staffing services | Education
Disaggregation of Revenue [Line Items]
Revenue	288.8	247.6
Staffing services | International
Disaggregation of Revenue [Line Items]
Revenue	0.0	190.2
Permanent placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	2.7	4.6
Permanent placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	4.2	5.5
Permanent placement | Education
Disaggregation of Revenue [Line Items]
Revenue	1.1	1.8
Permanent placement | International
Disaggregation of Revenue [Line Items]
Revenue	0.0	5.6
Outcome-based services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	124.5	129.4
Outcome-based services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	89.9	98.6
Talent solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	108.0	114.6
Total Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (0.5)	$ (0.5)

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