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Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 1,386.9	$ 1,333.6	$ 2,756.8	$ 2,623.3
Outcome-Based Services
Disaggregation of Revenue [Line Items]
Revenue	123.1		239.3
Global Talent Solutions
Disaggregation of Revenue [Line Items]
Revenue	500.7		986.5
Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	604.0		1,208.3
International Staffing
Disaggregation of Revenue [Line Items]
Revenue	286.6		571.3
Talent Fulfillment [Member]
Disaggregation of Revenue [Line Items]
Revenue	377.6		747.2
Commercial | Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	414.5		812.9
Educational Staffing | Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	110.0		240.1
Professional/Technical | Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	70.1		137.5
Permanent Placement | Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue	9.4		17.8
Permanent Placement | International Staffing
Disaggregation of Revenue [Line Items]
Revenue	7.5		15.3
Permanent Placement | Talent Fulfillment [Member]
Disaggregation of Revenue [Line Items]
Revenue	0.4		0.8
Staffing Solutions | International Staffing
Disaggregation of Revenue [Line Items]
Revenue	279.1		556.0
Staffing Solutions | Talent Fulfillment [Member]
Disaggregation of Revenue [Line Items]
Revenue	288.3		572.5
Talent Solutions | Talent Fulfillment [Member]
Disaggregation of Revenue [Line Items]
Revenue	88.9		173.9
Less: Intersegment
Disaggregation of Revenue [Line Items]
Revenue	$ (4.4)		$ (9.3)

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No definition available.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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