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Investment in PersolKelly Asia Pacific (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jul. 04, 2016	Oct. 02, 2016	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Schedule of Equity Method Investments [Line Items]
Investment in equity affiliate			$ 121.3	$ 117.4
Equity in net earnings (loss) of affiliate			5.2	2.7	$ 1.1
Gain on investment in PersolKelly Asia Pacific			0.0	0.0	87.2
Advances to PersolKelly Asia Pacific			7.0
Accounts payable			$ 540.6	537.7
PersolKelly Asia Pacific
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%		49.00%
Proceeds from investment in PersolKelly Asia Pacific equity affiliate	$ 36.5
Investment in equity affiliate	$ 104.2
Deconsolidated goodwill		$ 1.9
Post-close cash true-up adjustment					4.5
Equity in net earnings (loss) of affiliate			$ 5.2	2.7	1.1
Gain on investment in PersolKelly Asia Pacific		87.2
Tax expense on gain on investment in PersolKelly Asia Pacific equity affiliate		$ 23.5			$ 23.5
Due from PersolKelly Asia Pacific			10.2
Advances to PersolKelly Asia Pacific			7.0
Due to PersolKelly Asia Pacific				2.3
TS Kelly Workforce Solutions
Schedule of Equity Method Investments [Line Items]
Repayment of loan				0.6
PersolKelly Asia Pacific
Schedule of Equity Method Investments [Line Items]
Accounts payable			$ 0.2	$ 2.5

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