Fair Value Measurements of Financial Instruments - Assets (Details) - USD ($) $ in Millions	Oct. 01, 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)	$ 21.1	$ 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)	21.1	52.3
Derivative financial instruments - liability		(1.0)
Deferred stock-based compensation	(4.3)	(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)	21.1	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	(4.3)	(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	5.4	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	5.4	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	7.2	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	7.2	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)