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Fair Value Measurements - Narrative (Details)
€ in Millions, $ in Millions
 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 05, 2024
USD ($)
Jan. 05, 2024
USD ($)
Mar. 31, 2024
USD ($)
Apr. 02, 2023
USD ($)
Dec. 31, 2023
USD ($)
Feb. 08, 2024
EUR (€)
Nov. 02, 2023
EUR (€)
Feb. 14, 2022
country
Jan. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Unrealized gain (loss) on derivatives     $ 0.1   $ (3.6)        
Foreign currency forward contract, asset, net     0.1            
Foreign currency forward contract, liability, net         3.6        
Payments for derivative instrument, investing activities $ 2.4   2.4 $ 0.0          
Gain on forward contract     1.2 0.0          
Derivative Instruments Not Designated as Hedging Instruments, Loss   $ 2.4              
Payment for contingent consideration liability, financing activities     0.0 1.4          
Foreign Exchange Forward                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative, notional amount | €           € 17.0 € 90.0    
Brazil                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Indemnification liabilities, expense (income)     (0.1) 0.1          
Brazil | Maximum                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Indemnification liability     $ 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          
PersolKelly Pte. Ltd.                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Equity method investment, ownership percentage                 49.00%
Number of geographies in which entity operates | country               10  
Equity Ownership, Excluding Consolidated Entity and Equity Method Investee, Percentage     2.50%            
Equity securities without readily determinable fair value, with changes in fair value in net income     $ 6.4            
Other Assets                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Money market funds     7.6   8.0        
Level 3 | Brazil                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Indemnification liability     2.9   3.0        
Level 3 | EMEA                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Indemnification liability     2.1            
Level 3 | Greenwood/Asher                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Payment for contingent consideration liability       $ 3.3          
Level 3 | Accounts Payable and Accrued Liabilities | Brazil                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Indemnification liability     0.1   0.1        
Level 3 | Other Long Term Liabilities | Brazil                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Indemnification liability     $ 2.8   $ 2.9