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Fair Value Measurements - Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Millions
Jan. 01, 2023
Jan. 02, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Persol Holdings $ 0.0 $ 264.3
Measured on a recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 108.3 96.3
Investment in Persol Holdings 0.0 264.3
Total assets at fair value 108.3 360.6
Brazil indemnification (3.4) (2.4)
Total liabilities at fair value (6.7) (7.0)
Measured on a recurring basis | Greenwood/Asher    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earnout, fair value (3.3) (4.6)
Measured on a recurring basis | RocketPower    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earnout, fair value 0.0  
Measured on a recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 108.3 96.3
Investment in Persol Holdings 0.0 264.3
Total assets at fair value 108.3 360.6
Brazil indemnification 0.0 0.0
Total liabilities at fair value 0.0 0.0
Measured on a recurring basis | Level 1 | Greenwood/Asher    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earnout, fair value 0.0 0.0
Measured on a recurring basis | Level 1 | RocketPower    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earnout, fair value 0.0  
Measured on a recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0.0 0.0
Investment in Persol Holdings 0.0 0.0
Total assets at fair value 0.0 0.0
Brazil indemnification 0.0 0.0
Total liabilities at fair value 0.0 0.0
Measured on a recurring basis | Level 2 | Greenwood/Asher    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earnout, fair value 0.0 0.0
Measured on a recurring basis | Level 2 | RocketPower    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earnout, fair value 0.0  
Measured on a recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0.0 0.0
Investment in Persol Holdings 0.0 0.0
Total assets at fair value 0.0 0.0
Brazil indemnification (3.4) (2.4)
Total liabilities at fair value (6.7) (7.0)
Measured on a recurring basis | Level 3 | Greenwood/Asher    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earnout, fair value (3.3) $ (4.6)
Measured on a recurring basis | Level 3 | RocketPower    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earnout, fair value $ 0.0