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Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,267.7	$ 1,342.4	$ 4,017.8	$ 4,099.2
Outcome-Based Services
Disaggregation of Revenue [Line Items]
Revenue	159.6	134.0	468.9	373.3
Global Talent Solutions
Disaggregation of Revenue [Line Items]
Revenue	502.5	507.6	1,509.4	1,494.1
Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	516.0	561.8	1,740.1	1,770.1
International Staffing
Disaggregation of Revenue [Line Items]
Revenue	252.9	277.2	779.9	848.5
Talent Fulfillment
Disaggregation of Revenue [Line Items]
Revenue	342.9	373.6	1,040.5	1,120.8
Commercial | Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	366.8	424.3	1,143.4	1,237.2
Educational Staffing | Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	57.5	57.7	314.5	297.8
Professional/Technical | Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	83.2	68.8	256.0	206.3
Permanent Placement | Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	8.5	11.0	26.2	28.8
Permanent Placement | International Staffing
Disaggregation of Revenue [Line Items]
Revenue	6.1	6.8	19.2	22.1
Permanent Placement | Talent Fulfillment
Disaggregation of Revenue [Line Items]
Revenue	0.5	0.6	1.3	1.4
Staffing Solutions | International Staffing
Disaggregation of Revenue [Line Items]
Revenue	246.8	270.4	760.7	826.4
Staffing Solutions | Talent Fulfillment
Disaggregation of Revenue [Line Items]
Revenue	251.2	279.0	765.0	851.5
Talent Solutions | Talent Fulfillment
Disaggregation of Revenue [Line Items]
Revenue	91.2	94.0	274.2	267.9
Less: Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (3.7)	$ (4.2)	$ (11.6)	$ (13.5)

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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