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Revenue - Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 1,205.9	$ 1,261.1
Americas
Disaggregation of Revenue [Line Items]
Revenue	951.4	1,016.8
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	8.3	6.7
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue	254.7	270.2
Science, Engineering & Technology | Americas
Disaggregation of Revenue [Line Items]
Revenue	253.2	268.4
Science, Engineering & Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	1.5	1.8
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue	99.3	89.5
Outsourcing & Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue	84.8	74.6
Outsourcing & Consulting | Europe
Disaggregation of Revenue [Line Items]
Revenue	6.2	8.2
Outsourcing & Consulting | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	8.3	6.7
International
Disaggregation of Revenue [Line Items]
Revenue	272.9	265.2
International | Americas
Disaggregation of Revenue [Line Items]
Revenue	34.3	37.6
International | Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 238.6	$ 227.6

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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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