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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from services	$ 4,516.0	$ 5,355.6	$ 5,513.9
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	1,858.4	2,213.4	2,430.9
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	1,019.1	1,131.8	1,002.6
Education
Disaggregation of Revenue [Line Items]
Revenue from services	286.9	450.7	428.5
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue from services	363.5	377.7	377.1
International
Disaggregation of Revenue [Line Items]
Revenue from services	988.6	1,182.5	1,275.2
Staffing services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	1,423.3	1,838.6	2,100.4
Staffing services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	751.8	848.2	814.3
Staffing services | Education
Disaggregation of Revenue [Line Items]
Revenue from services	286.4	449.8	427.1
Staffing services | International
Disaggregation of Revenue [Line Items]
Revenue from services	971.8	1,156.8	1,245.1
Permanent Placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	9.9	17.9	21.6
Permanent Placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	12.5	15.7	15.9
Permanent Placement | Education
Disaggregation of Revenue [Line Items]
Revenue from services	0.5	0.9	1.4
Permanent Placement | International
Disaggregation of Revenue [Line Items]
Revenue from services	16.8	25.7	30.1
Outcome-Based Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	425.2	356.9	308.9
Outcome-Based Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	254.8	267.9	172.4
Talent Solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue from services	363.5	377.7	377.1
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from services	$ (0.5)	$ (0.5)	$ (0.4)

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