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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from services	$ 5,513.9	$ 5,374.4
Outcome-Based Services
Disaggregation of Revenue [Line Items]
Revenue from services	515.1
Global Talent Solutions
Disaggregation of Revenue [Line Items]
Revenue from services	1,997.4
Americas Staffing
Disaggregation of Revenue [Line Items]
Revenue from services	2,417.7
Americas Staffing | Commercial
Disaggregation of Revenue [Line Items]
Revenue from services	1,679.6
Americas Staffing | Educational Staffing
Disaggregation of Revenue [Line Items]
Revenue from services	428.0
Americas Staffing | PT
Disaggregation of Revenue [Line Items]
Revenue from services	272.2
Americas Staffing | Permanent Placement
Disaggregation of Revenue [Line Items]
Revenue from services	37.9
International Staffing
Disaggregation of Revenue [Line Items]
Revenue from services	1,116.6
International Staffing | Permanent Placement
Disaggregation of Revenue [Line Items]
Revenue from services	28.9
International Staffing | Staffing Solutions
Disaggregation of Revenue [Line Items]
Revenue from services	1,087.7
Talent Fulfillment
Disaggregation of Revenue [Line Items]
Revenue from services	1,482.3
Talent Fulfillment | Permanent Placement
Disaggregation of Revenue [Line Items]
Revenue from services	1.9
Talent Fulfillment | Staffing Solutions
Disaggregation of Revenue [Line Items]
Revenue from services	1,117.6
Talent Fulfillment | Talent Solutions
Disaggregation of Revenue [Line Items]
Revenue from services	362.8
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from services	$ (17.8)

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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