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Revenue - Disaggregation of Revenue and Deferred Costs Narrative (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
Total EMEA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 1,067.9 | 1,162.5 |
Total EMEA | Global Talent Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 42.1 | 45.9 |
Total Americas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 4,260.9 | 4,329.2 |
Total Americas | Global Talent Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from services | 1,955.5 | 1,929.3 |
Deferred Sales Commissions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized contract cost, gross | 1.5 | 2.3 |
Capitalized contract cost, amortization | 1.6 | 1.7 |
Deferred Fulfillment Costs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized contract cost, gross | 3.6 | 3.0 |
Capitalized contract cost, amortization | $ 14.6 | $ 13.0 |

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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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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