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Fair Value Measurements of Financial Instruments - Assets (Details) - USD ($)
$ in Millions
Jul. 02, 2022
Jan. 01, 2022
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents (including money market funds) $ 19.6 $ 52.3
Fair value, measurements, recurring    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents (including money market funds) 19.6 52.3
Derivative financial instruments - liability   (1.0)
Deferred stock-based compensation (5.5) (8.1)
Fair value, measurements, recurring | Quoted prices in active markets for identical assets (Level 1)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents (including money market funds) 19.6 52.3
Derivative financial instruments - liability   0.0
Deferred stock-based compensation 0.0 0.0
Fair value, measurements, recurring | Significant other observable inputs (Level 2)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents (including money market funds) 0.0 0.0
Derivative financial instruments - liability   (1.0)
Deferred stock-based compensation (5.5) (8.1)
Fair value, measurements, recurring | Significant unobservable inputs (Level 3)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents (including money market funds) 0.0 0.0
Derivative financial instruments - liability   0.0
Deferred stock-based compensation 0.0 0.0
Fair value, measurements, recurring | Government securities    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 5.8 5.5
Fair value, measurements, recurring | Government securities | Quoted prices in active markets for identical assets (Level 1)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0.0 0.0
Fair value, measurements, recurring | Government securities | Significant other observable inputs (Level 2)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 5.8 5.5
Fair value, measurements, recurring | Government securities | Significant unobservable inputs (Level 3)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0.0 0.0
Fair value, measurements, recurring | Corporate bonds    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 7.0 7.8
Fair value, measurements, recurring | Corporate bonds | Quoted prices in active markets for identical assets (Level 1)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0.0 0.0
Fair value, measurements, recurring | Corporate bonds | Significant other observable inputs (Level 2)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 7.0 7.8
Fair value, measurements, recurring | Corporate bonds | Significant unobservable inputs (Level 3)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0.0 0.0
Fair value, measurements, recurring | Put option    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments - liability (5.1) (5.1)
Fair value, measurements, recurring | Put option | Quoted prices in active markets for identical assets (Level 1)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments - liability 0.0 0.0
Fair value, measurements, recurring | Put option | Significant other observable inputs (Level 2)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments - liability 0.0 0.0
Fair value, measurements, recurring | Put option | Significant unobservable inputs (Level 3)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments - liability $ (5.1) $ (5.1)