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Segment Disclosures - Segment Revenue From Service (Details) - Service - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Revenue from Services
Segment revenue from services	$ 1,267.7	$ 1,342.4	$ 4,017.8	$ 4,099.2
Less: Intersegment revenue
Revenue from Services
Segment revenue from services	(3.7)	(4.2)	(11.6)	(13.5)
Americas Staffing | Reporting Segments
Revenue from Services
Segment revenue from services	516.0	561.8	1,740.1	1,770.1
Global Talent Solutions | Reporting Segments
Revenue from Services
Segment revenue from services	502.5	507.6	1,509.4	1,494.1
International Staffing | Reporting Segments
Revenue from Services
Segment revenue from services	$ 252.9	$ 277.2	$ 779.9	$ 848.5

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 32
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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