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Subsequent Events - Narrative (Details) - USD ($)
$ in Millions
2 Months Ended 12 Months Ended
Feb. 15, 2022
Feb. 14, 2022
Feb. 15, 2022
Jan. 02, 2022
Jan. 03, 2021
Dec. 29, 2019
Dec. 31, 2006
Subsequent Event [Line Items]              
Investment in equity affiliate       $ 123.4 $ 118.5    
Deferred tax liabilities       71.6 39.7    
Equity in net earnings (loss) of affiliate       5.4 0.8 $ (3.6)  
(Gain) loss on investment in Persol Holdings       (121.8) 16.6 $ (35.8)  
Investment in Persol Holdings       264.3 164.2    
Proceeds from (investment in) equity securities       5.0      
Persol Holdings Investment              
Subsequent Event [Line Items]              
Deferred tax liabilities       70.9      
Cost of equity securities       18.0 $ 20.1   $ 33.9
Investment in Persol Holdings       264.3      
PersolKelly Pte. Ltd.              
Subsequent Event [Line Items]              
Investment in equity affiliate       123.4      
Deferred tax liabilities       $ 13.3      
Equity method investment, ownership percentage       49.00% 49.00%    
Subsequent Event | Persol Holdings Investment              
Subsequent Event [Line Items]              
Stock repurchased during period, value   $ 27.2          
(Gain) loss on investment in Persol Holdings     $ 52.4        
Debt and equity securities, realized gain (loss)     $ (46.5)        
Proceeds from (investment in) equity securities $ 197.4            
Subsequent Event | Persol Holdings Investment | Class A common stock              
Subsequent Event [Line Items]              
Stock repurchased during period, shares   1,576,169          
Subsequent Event | Persol Holdings Investment | Class B common stock              
Subsequent Event [Line Items]              
Stock repurchased during period, shares   1,475          
Subsequent Event | PersolKelly Pte. Ltd.              
Subsequent Event [Line Items]              
Equity method investment, amount sold, percentage   95.00%          
Equity method investment, amount sold   $ 119.5          
Equity method investment, ownership percentage   2.50%