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Revenue - Revenue by Country (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
United States
Disaggregation of Revenue [Line Items]
Revenue from services	3,930.0	3,894.6
Canada
Disaggregation of Revenue [Line Items]
Revenue from services	142.4	140.3
Mexico
Disaggregation of Revenue [Line Items]
Revenue from services	125.0	118.8
Puerto Rico
Disaggregation of Revenue [Line Items]
Revenue from services	96.6	68.3
Brazil
Disaggregation of Revenue [Line Items]
Revenue from services	35.2	48.6
Total Americas
Disaggregation of Revenue [Line Items]
Revenue from services	4,329.2	4,270.6
France
Disaggregation of Revenue [Line Items]
Revenue from services	278.9	277.1
Switzerland
Disaggregation of Revenue [Line Items]
Revenue from services	212.7	216.9
Portugal
Disaggregation of Revenue [Line Items]
Revenue from services	196.9	176.0
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue from services	108.8	88.7
Russia
Disaggregation of Revenue [Line Items]
Revenue from services	100.4	93.2
Italy
Disaggregation of Revenue [Line Items]
Revenue from services	77.5	61.9
Germany
Disaggregation of Revenue [Line Items]
Revenue from services	57.1	59.9
Ireland
Disaggregation of Revenue [Line Items]
Revenue from services	44.6	32.0
Norway
Disaggregation of Revenue [Line Items]
Revenue from services	34.4	33.3
Other
Disaggregation of Revenue [Line Items]
Revenue from services	51.2	46.5
Total EMEA
Disaggregation of Revenue [Line Items]
Revenue from services	1,162.5	1,085.5
Total APAC
Disaggregation of Revenue [Line Items]
Revenue from services	$ 22.2	$ 18.3

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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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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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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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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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