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Revenue - Revenue by Country (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
United States
Disaggregation of Revenue [Line Items]
Revenue from services	3,892.5	3,930.0
Canada
Disaggregation of Revenue [Line Items]
Revenue from services	136.1	142.4
Mexico
Disaggregation of Revenue [Line Items]
Revenue from services	123.6	125.0
Puerto Rico
Disaggregation of Revenue [Line Items]
Revenue from services	74.6	96.6
Brazil
Disaggregation of Revenue [Line Items]
Revenue from services	34.1	35.2
Total Americas
Disaggregation of Revenue [Line Items]
Revenue from services	4,260.9	4,329.2
France
Disaggregation of Revenue [Line Items]
Revenue from services	248.6	278.9
Switzerland
Disaggregation of Revenue [Line Items]
Revenue from services	200.7	212.7
Portugal
Disaggregation of Revenue [Line Items]
Revenue from services	179.8	196.9
Russia
Disaggregation of Revenue [Line Items]
Revenue from services	117.6	100.4
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue from services	103.1	108.8
Italy
Disaggregation of Revenue [Line Items]
Revenue from services	75.9	77.5
Germany
Disaggregation of Revenue [Line Items]
Revenue from services	41.6	57.1
Ireland
Disaggregation of Revenue [Line Items]
Revenue from services	33.1	44.6
Other
Disaggregation of Revenue [Line Items]
Revenue from services	67.5	85.6
Total EMEA
Disaggregation of Revenue [Line Items]
Revenue from services	1,067.9	1,162.5
Total APAC
Disaggregation of Revenue [Line Items]
Revenue from services	$ 26.8	$ 22.2

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No definition available.

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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.

+ 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

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