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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Disaggregation of Revenue [Line Items]
Revenue from services	$ 4,835.7	$ 4,965.4	$ 4,909.7
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	1,483.1	1,666.2	1,837.4
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	1,190.8	1,265.4	1,156.8
Education
Disaggregation of Revenue [Line Items]
Revenue from services	841.9	636.2	416.5
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue from services	454.7	468.0	432.1
International
Disaggregation of Revenue [Line Items]
Revenue from services	884.8	932.2	1,067.8
Staffing services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	1,029.0	1,228.2	1,402.4
Staffing services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	792.7	869.0	813.2
Staffing services | Education
Disaggregation of Revenue [Line Items]
Revenue from services	834.9	627.8	411.5
Staffing services | International
Disaggregation of Revenue [Line Items]
Revenue from services	860.2	892.3	1,032.9
Permanent Placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	12.9	28.9	24.7
Permanent Placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	17.8	29.7	24.4
Permanent Placement | Education
Disaggregation of Revenue [Line Items]
Revenue from services	7.0	8.4	5.0
Permanent Placement | International
Disaggregation of Revenue [Line Items]
Revenue from services	21.8	22.6	21.3
Outcome-Based Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	441.2	409.1	410.3
Outcome-Based Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	380.3	366.7	319.2
Talent Solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue from services	454.7	468.0	432.1
Talent Solutions | International
Disaggregation of Revenue [Line Items]
Revenue from services	2.8	17.3	13.6
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from services	$ (19.6)	$ (2.6)	$ (0.9)

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