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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2023	Oct. 02, 2022	Oct. 01, 2023	Oct. 02, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 1,118.0	$ 1,167.9	$ 3,603.5	$ 3,731.6
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	364.5	408.6	1,131.3	1,268.7
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	295.7	321.3	903.5	962.7
Education
Disaggregation of Revenue [Line Items]
Revenue	128.1	104.3	583.9	433.2
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	114.1	118.5	342.4	352.0
International
Disaggregation of Revenue [Line Items]
Revenue	220.6	215.5	657.5	715.9
Staffing services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	253.8	297.9	785.6	942.3
Staffing services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	197.7	220.6	601.2	664.3
Staffing services | Education
Disaggregation of Revenue [Line Items]
Revenue	126.6	103.0	578.3	427.4
Staffing services | International
Disaggregation of Revenue [Line Items]
Revenue	214.5	205.8	639.3	684.7
Permanent placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	3.1	6.1	10.9	24.0
Permanent placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	4.3	7.1	14.1	23.6
Permanent placement | Education
Disaggregation of Revenue [Line Items]
Revenue	1.5	1.3	5.6	5.8
Permanent placement | International
Disaggregation of Revenue [Line Items]
Revenue	5.7	5.3	17.2	17.8
Outcome-based services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	107.6	104.6	334.8	302.4
Outcome-based services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	93.7	93.6	288.2	274.8
Talent solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	114.1	118.5	342.4	352.0
Talent solutions | International
Disaggregation of Revenue [Line Items]
Revenue	0.4	4.4	1.0	13.4
Total Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (5.0)	$ (0.3)	$ (15.1)	$ (0.9)

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