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Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Dec. 30, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Line Items]
Earnings invested in the business	$ 1,224.6		$ 1,224.6		$ 1,138.1
Revenue	1,267.7	$ 1,342.4	4,017.8	$ 4,099.2
Americas
Revenue from Contract with Customer [Line Items]
Revenue	997.4	1,048.1	3,186.5	3,199.5
Americas | Global Talent Solutions
Revenue from Contract with Customer [Line Items]
Revenue	485.0	490.4	1,457.8	1,442.9
EMEA
Revenue from Contract with Customer [Line Items]
Revenue	262.8	288.1	811.7	882.8
EMEA | Global Talent Solutions
Revenue from Contract with Customer [Line Items]
Revenue	10.0	11.0	32.0	34.3
Deferred Sales Commissions
Revenue from Contract with Customer [Line Items]
Capitalized contract cost	1.6		1.6		2.3
Capitalized contract cost, amortization	0.4	0.4	1.3	1.2
Deferred Fulfillment Costs
Revenue from Contract with Customer [Line Items]
Capitalized contract cost	3.6		3.6		$ 3.0
Capitalized contract cost, amortization	$ 3.8	$ 4.1	$ 10.3	$ 8.7
Accounting Standards Update 2014-09
Revenue from Contract with Customer [Line Items]
Earnings invested in the business						$ 3.4
Difference between Revenue Guidance in Effect before and after Topic 606
Revenue from Contract with Customer [Line Items]
Contract with customer, asset, gross						5.2
Deferred tax liabilities, net						1.2
Transferred at Point in Time | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue from Contract with Customer [Line Items]
Deferred revenue						$ 0.6

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