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Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Earnings invested in the business	$ 1,134.8		$ 1,134.8			$ 983.6
Revenue	1,386.9	$ 1,333.6	$ 2,756.8	$ 2,623.3
Customer payment terms			60 days
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]
Customer contracts					5.2
Deferred tax liability					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
Americas
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	1,083.4	1,063.3	$ 2,151.4	2,107.8
Americas | Global Talent Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	483.9	492.0	952.5	967.7
EMEA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	297.9	265.8	594.7	506.8
EMEA | Global Talent Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	11.2	$ 9.0	23.3	$ 16.4
Deferred Sales Commissions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost	2.6		2.6		3.2
Capitalized contract cost, amortization expense	0.4		0.8
Deferred Fulfillment Costs
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost	3.4		3.4		$ 2.0
Capitalized contract cost, amortization expense	$ 2.5		$ 4.6

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