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Fair Value Measurements - Narrative (Details)
€ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Feb. 15, 2022
USD ($)
Jul. 02, 2023
USD ($)
Apr. 02, 2023
USD ($)
Jan. 01, 2023
USD ($)
Oct. 02, 2022
USD ($)
Apr. 03, 2022
USD ($)
Oct. 03, 2021
USD ($)
Jul. 04, 2021
USD ($)
Apr. 04, 2021
USD ($)
Dec. 31, 2023
USD ($)
Jan. 01, 2023
USD ($)
Jan. 02, 2022
USD ($)
Nov. 02, 2023
EUR (€)
Jul. 03, 2022
USD ($)
Mar. 07, 2022
USD ($)
Mar. 08, 2021
USD ($)
Jan. 03, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Payment to settle indemnification liabilities   $ 0.4                              
Unrealized loss on forward contract                   $ 3.6 $ 0.0 $ 0.0          
Payment for contingent consideration liability, financing activities                   2.5 3.3 1.6          
Equity securities, FV-NI and without readily determinable fair value       $ 6.4           6.4 6.4            
Proceeds from sale of equity securities, fv-ni                   0.0 196.9 0.0          
Goodwill impairment charge       10.3 $ 30.7         0.0 41.0 0.0          
Foreign Exchange Forward                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Derivative, notional amount | €                         € 90.0        
Foreign currency forward contract, net                   $ 3.6              
PersolKelly Pte. Ltd.                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Equity ownership, excluding consolidated entity and equity method investee, percentage                   2.50%              
PersolKelly Pte. Ltd.                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Equity securities, FV-NI and without readily determinable fair value                   $ 6.4              
Business Talent Group, LLC                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Proceeds from sale of equity securities, fv-ni               $ 5.0                  
Brazil                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Disposition, indemnification liabilities, expense                   (0.3)              
Brazil | Maximum                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Disposition, indemnification liabilities                   8.8              
Greenwood/Asher                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Payment for contingent consideration liability, financing activities                   $ 1.4 0.7            
Expense related to earnout liability                     1.0            
RocketPower                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Contingent consideration, liability                             $ 0.6    
Goodwill impairment charge                     41.0            
Insight                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Payment for contingent consideration liability             $ 1.8                    
Expense related to earnout liability                       $ 0.1          
PersolKelly Pte. Ltd.                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Equity ownership, excluding consolidated entity and equity method investee, percentage                   2.50%              
Equity securities, FV-NI and without readily determinable fair value                   $ 6.4              
Persol Holdings Investment                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Proceeds from sale of equity securities, fv-ni $ 196.9                                
Kenzie Academy Inc.                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Equity securities, FV-NI and without readily determinable fair value                               $ 1.4  
Debt and equity securities, realized gain (loss)                 $ (1.4)                
Other Assets                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Money market funds       6.5           8.0 6.5            
Level 3 | Brazil                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Disposition, indemnification liabilities       3.4           3.0 3.4            
Level 3 | Greenwood/Asher                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Contingent consideration, liability       3.3           0.0 3.3            
Payment for contingent consideration liability     $ 3.3     $ 2.3                      
Level 3 | RocketPower                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Contingent consideration, liability         $ 0.0         0.0       $ 0.6      
Level 3 | Insight                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Contingent consideration, liability                                 $ 1.7
Level 3 | Accounts Payable and Accrued Liabilities | Brazil                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Disposition, indemnification liabilities       0.3           0.1 0.3            
Level 3 | Accounts Payable and Accrued Liabilities | RocketPower                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Contingent consideration, liability                           0.5      
Level 3 | Other Long Term Liabilities | Brazil                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Disposition, indemnification liabilities       $ 3.1           $ 2.9 $ 3.1            
Level 3 | Other Long Term Liabilities | RocketPower                                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                  
Contingent consideration, liability                           $ 0.1