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Investment in PersolKelly Asia Pacific - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 29, 2019 USD ($) country	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 29, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity in net earnings (loss) of affiliate	$ (3.6)	$ 5.2	$ 2.7
Investment in equity affiliate	117.2	121.3
Advances to PersolKelly Asia Pacific	4.4
Accounts payable	$ 503.6	540.6
PersolKelly Asia Pacific
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Due from PersolKelly Asia Pacific	$ 10.9	10.2
Advances to PersolKelly Asia Pacific		7.0		$ 4.4
Number of Countries in which Entity Operates | country	10
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	$ 0.2

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