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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | $ 5,355.6 | $ 5,513.9 | $ 5,374.4
Outcome-Based Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 641.4 | 515.1 |
Global Talent Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 2,024.5 | 1,997.4 |
Americas Staffing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 2,320.1 | 2,417.7 |
Americas Staffing | Commercial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 1,502.3 | 1,679.6 |
Americas Staffing | Education |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 451.9 | 428.0 |
Americas Staffing | PT |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 332.4 | 272.2 |
Americas Staffing | Permanent Placement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 33.5 | 37.9 |
International Staffing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 1,025.9 | 1,116.6 |
International Staffing | Permanent Placement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 24.8 | 28.9 |
International Staffing | Staffing Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 1,001.1 | 1,087.7 |
Talent Fulfillment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 1,383.1 | 1,482.3 |
Talent Fulfillment | Permanent Placement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 1.8 | 1.9 |
Talent Fulfillment | Staffing Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 1,015.5 | 1,117.6 |
Talent Fulfillment | Talent Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 365.8 | 362.8 |
Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | $ (14.9) | $ (17.8) |

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- Definition 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. + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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