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Revenue - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Earnings invested in the business	$ 1,138.1	$ 983.6
Revenue from services	$ 5,513.9	5,374.4
Revenue, payment terms	60 days
Capitalized contract cost, gross	$ 2.3
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Earnings invested in the business			$ 3.4
Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset			5.2
Deferred tax liabilities			1.2
Transferred at Point in Time | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue			0.6
Total EMEA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from services	1,162.5	1,085.5
Total EMEA | Global Talent Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from services	45.9	37.4
Total Americas
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from services	4,329.2	4,270.6
Total Americas | Global Talent Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from services	1,929.3	$ 1,943.3
Deferred Sales Commissions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost, gross			3.2
Capitalized contract cost, amortization	1.7
Deferred Fulfillment Costs
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost, gross	3.0		$ 2.0
Capitalized contract cost, amortization	$ 13.0

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