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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 1,038.2	$ 1,267.7	$ 3,274.6	$ 4,017.8
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	446.5	538.0	1,346.7	1,668.7
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	244.0	285.2	761.5	859.7
Education
Disaggregation of Revenue [Line Items]
Revenue	27.5	57.1	195.1	313.9
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	87.9	94.4	261.0	282.3
International
Disaggregation of Revenue [Line Items]
Revenue	232.4	293.4	710.6	893.6
Staffing Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	341.3	445.0	1,033.1	1,398.5
Staffing Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	181.6	213.5	562.3	646.7
Staffing Services | Education
Disaggregation of Revenue [Line Items]
Revenue	27.4	56.9	194.9	313.3
Staffing Services | International
Disaggregation of Revenue [Line Items]
Revenue	228.8	287.0	697.9	873.6
Permanent Placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	2.3	4.2	7.0	14.4
Permanent Placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	3.1	4.3	9.0	11.8
Permanent Placement | Education
Disaggregation of Revenue [Line Items]
Revenue	0.1	0.2	0.2	0.6
Permanent Placement | International
Disaggregation of Revenue [Line Items]
Revenue	3.6	6.4	12.7	20.0
Outcome-Based Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue	102.9	88.8	306.6	255.8
Outcome-Based Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	59.3	67.4	190.2	201.2
Talent Solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	87.9	94.4	261.0	282.3
Less: Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (0.1)	$ (0.4)	$ (0.3)	$ (0.4)

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