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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. 02, 2023
Apr. 03, 2022
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       $ 0.0 $ 196.9
Loss on investment in Persol Holdings       0.0 (67.2)
Equity securities gain (loss)     $ (52.4)    
Loss on currency translation from liquidation of subsidiary       0.0 (20.4)
Foreign currency transaction gain       $ 0.0 5.5
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        
Loss on investment in Persol Holdings         (67.2)
Equity securities 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