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Investment in Persol Holdings - Narrative (Details) - USD ($) $ in Millions			2 Months Ended	3 Months Ended
	Feb. 15, 2022	Feb. 14, 2022	Feb. 15, 2022	Apr. 03, 2022	Apr. 04, 2021
Schedule of Equity Method Investments [Line Items]
Stock repurchased during period, amount in excess of par value		$ 25.6
Proceeds from sale of Persol Holdings investment				$ 196.9	$ 0.0
Gain (loss) on investment in Persol Holdings				(67.2)	30.0
Loss on currency translation from liquidation of subsidiary				(20.4)	0.0
Foreign currency transaction gain				5.5	0.0
Equity Securities, FV-NI, Gain (Loss)			$ (52.4)		$ 30.0
Persol Holdings Investment
Schedule of Equity Method Investments [Line Items]
Stock repurchased during period, value		$ 27.2
Proceeds from sale of Persol Holdings investment	$ 196.9
Gain (loss) on investment in Persol Holdings				(67.2)
Equity Securities, FV-NI, Gain (Loss)	$ (14.8)
Persol Holdings Investment | Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Stock repurchased during period, shares		1,576,169
Persol Holdings Investment | Class B Common Stock
Schedule of Equity Method Investments [Line Items]
Stock repurchased during period, shares		1,475
Kelly Services Japan, Inc.
Schedule of Equity Method Investments [Line Items]
Loss on currency translation from liquidation of subsidiary				20.4
Foreign currency transaction gain				$ 5.5

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