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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Summary of Debt Refinancing Costs
The deferred finance costs of $0.6 million (December 31, 2021 – $1.0 million) related to the arrangement of the credit facility, are included within other current and
non-current
assets at the balance sheet dates.
 
(in millions)
   
2022
     
2021
  
Gross cost at January 1
    $ 1.8      $ 1.8  
Capitalized in the year
      —          —    
    
 
 
     
 
 
  
       1.8        1.8  
    
 
 
     
 
 
  
Accumulated amortization at January 1
    $ (0.8 )     $ (0.5 ) 
Amortization in the year
      (0.4 )       (0.3 ) 
    
 
 
     
 
 
  
     $ (1.2 )     $ (0.8 ) 
    
 
 
     
 
 
  
Net book value at December 31
    $ 0.6      $ 1.0