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Fair Value Measurements of Financial Instruments - Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents (including money market funds) $ 24.4 $ 17.4
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) 24.4 17.4
Deferred stock-based compensation (5.5) (4.7)
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) 24.4 17.4
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
Deferred stock-based compensation (5.5) (4.7)
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
Deferred stock-based compensation 0.0 0.0
Fair value, measurements, recurring | SERP    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 10.9  
SERP liabilities (10.9)  
Fair value, measurements, recurring | SERP | 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 10.9  
SERP liabilities (10.9)  
Fair value, measurements, recurring | SERP | Significant other observable inputs (Level 2)    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0.0  
SERP liabilities 0.0  
Fair value, measurements, recurring | SERP | 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  
SERP liabilities 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 5.5 5.6
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 5.5 5.6
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 7.1 7.2
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 7.1 7.2
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 liability    
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 liability | 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 liability | 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 liability | 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)