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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 935.0	$ 1,038.1	$ 3,201.7	$ 3,140.7
Reporting Segments
Disaggregation of Revenue [Line Items]
Revenue	936.1	1,038.7	3,204.3	3,142.3
Reporting Segments | Enterprise Talent Management
Disaggregation of Revenue [Line Items]
Revenue	487.9	561.6	1,542.1	1,626.9
Reporting Segments | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	304.9	335.0	944.6	832.3
Reporting Segments | Education
Disaggregation of Revenue [Line Items]
Revenue	143.3	142.1	717.6	683.1
Reporting Segments | Staffing Services
Disaggregation of Revenue [Line Items]
Revenue	584.4	651.5	2,110.9	2,071.6
Reporting Segments | Staffing Services | Enterprise Talent Management
Disaggregation of Revenue [Line Items]
Revenue	250.1	299.0	800.4	877.1
Reporting Segments | Staffing Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	191.8	211.1	597.4	515.8
Reporting Segments | Staffing Services | Education
Disaggregation of Revenue [Line Items]
Revenue	142.5	141.4	713.1	678.7
Reporting Segments | Outcome-based Services
Disaggregation of Revenue [Line Items]
Revenue	212.8	244.6	683.5	686.8
Reporting Segments | Outcome-based Services | Enterprise Talent Management
Disaggregation of Revenue [Line Items]
Revenue	108.5	130.9	362.5	390.5
Reporting Segments | Outcome-based Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	104.3	113.7	321.0	296.3
Reporting Segments | Outcome-based Services | Education
Disaggregation of Revenue [Line Items]
Revenue	0.0	0.0	0.0	0.0
Reporting Segments | Talent Solutions
Disaggregation of Revenue [Line Items]
Revenue	127.2	129.1	371.9	351.7
Reporting Segments | Talent Solutions | Enterprise Talent Management
Disaggregation of Revenue [Line Items]
Revenue	127.2	129.1	371.9	351.7
Reporting Segments | Talent Solutions | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	0.0	0.0	0.0	0.0
Reporting Segments | Talent Solutions | Education
Disaggregation of Revenue [Line Items]
Revenue	0.0	0.0	0.0	0.0
Reporting Segments | Permanent Placement
Disaggregation of Revenue [Line Items]
Revenue	11.7	13.5	38.0	32.2
Reporting Segments | Permanent Placement | Enterprise Talent Management
Disaggregation of Revenue [Line Items]
Revenue	2.1	2.6	7.3	7.6
Reporting Segments | Permanent Placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	8.8	10.2	26.2	20.2
Reporting Segments | Permanent Placement | Education
Disaggregation of Revenue [Line Items]
Revenue	0.8	0.7	4.5	4.4
Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (1.1)	$ (0.6)	$ (2.6)	$ (1.6)

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