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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Summary of Debt Refinancing Costs
(in millions)
  
2021
    
2020
 
Gross cost at January 1
   $ 1.8      $ 1.5  
Capitalized in the year
     —          0.3  
    
 
 
    
 
 
 
       1.8        1.8  
    
 
 
    
 
 
 
Accumulated amortization at January 1
   $ (0.5    $ (0.1
Amortization in the year
     (0.3      (0.4
    
 
 
    
 
 
 
     $ (0.8    $ (0.5
    
 
 
    
 
 
 
Net book value at December 31
   $ 1.0      $ 1.3