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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 1,258.1	$ 975.3	$ 2,464.0	$ 2,236.4
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	466.5	406.4	934.1	900.2
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	298.2	247.3	552.9	517.5
Education
Disaggregation of Revenue [Line Items]
Revenue	105.9	25.1	217.5	167.6
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	107.3	83.6	206.6	173.1
International
Disaggregation of Revenue [Line Items]
Revenue	280.4	213.0	553.3	478.2
Staffing Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	359.8	300.6	712.3	689.0
Staffing Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	212.9	181.6	399.1	380.8
Staffing Services | Education
Disaggregation of Revenue [Line Items]
Revenue	104.1	25.1	214.9	167.5
Staffing Services | International
Disaggregation of Revenue [Line Items]
Revenue	272.0	209.6	537.6	469.1
Permanent Placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	5.3	1.7	10.2	4.7
Permanent Placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	6.1	2.5	10.9	5.9
Permanent Placement | Education
Disaggregation of Revenue [Line Items]
Revenue	1.8	0.0	2.6	0.1
Permanent Placement | International
Disaggregation of Revenue [Line Items]
Revenue	5.4	3.4	10.9	9.1
Outcome-Based Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	101.4	104.1	211.6	206.5
Outcome-Based Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	79.2	63.2	142.9	130.8
Talent Solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	107.3	83.6	206.6	173.1
Talent Solutions | International
Disaggregation of Revenue [Line Items]
Revenue	3.0	0.0	4.8	0.0
Less: Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (0.2)	$ (0.1)	$ (0.4)	$ (0.2)

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+ References

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