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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 1,205.9	$ 1,261.1
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	467.6	493.8
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	254.7	270.2
Education
Disaggregation of Revenue [Line Items]
Revenue	111.6	142.5
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	99.3	89.5
International
Disaggregation of Revenue [Line Items]
Revenue	272.9	265.2
Staffing Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	352.5	388.4
Staffing Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	186.2	199.2
Staffing Services | Education
Disaggregation of Revenue [Line Items]
Revenue	110.8	142.4
Staffing Services | International
Disaggregation of Revenue [Line Items]
Revenue	265.6	259.5
Permanent Placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	4.9	3.0
Permanent Placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	4.8	3.4
Permanent Placement | Education
Disaggregation of Revenue [Line Items]
Revenue	0.8	0.1
Permanent Placement | International
Disaggregation of Revenue [Line Items]
Revenue	5.5	5.7
Outcome-Based Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	110.2	102.4
Outcome-Based Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	63.7	67.6
Talent Solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	99.3	89.5
Talent Solutions | International
Disaggregation of Revenue [Line Items]
Revenue	1.8	0.0
Less: Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (0.2)	$ (0.1)

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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