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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 1,296.4	$ 1,205.9
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	444.3	467.6
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	317.1	254.7
Education
Disaggregation of Revenue [Line Items]
Revenue	173.4	111.6
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	109.1	99.3
International
Disaggregation of Revenue [Line Items]
Revenue	252.8	272.9
Staffing Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	334.9	352.5
Staffing Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	220.6	186.2
Staffing Services | Education
Disaggregation of Revenue [Line Items]
Revenue	171.9	110.8
Staffing Services | International
Disaggregation of Revenue [Line Items]
Revenue	241.7	265.6
Permanent Placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	10.2	4.9
Permanent Placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	8.0	4.8
Permanent Placement | Education
Disaggregation of Revenue [Line Items]
Revenue	1.5	0.8
Permanent Placement | International
Disaggregation of Revenue [Line Items]
Revenue	6.9	5.5
Outcome-Based Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	99.2	110.2
Outcome-Based Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	88.5	63.7
Talent Solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	109.1	99.3
Talent Solutions | International
Disaggregation of Revenue [Line Items]
Revenue	4.2	1.8
Less: Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (0.3)	$ (0.2)

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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