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Accounting for Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2023
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of Asset Retirement Obligations

The following is a reconciliation of asset retirement obligations as of December 31, 2023 and 2022:

  
December 31,
  
(millions of dollars)
  
2023
    
2022
  
Asset retirement obligation, beginning of period
  
$
23.8
    
$
24.4
  
Accretion expense
    
1.1
      
1.5
  
Other
    
(3.8
)
    
1.4
  
Payments
    
(0.1
)
    
(2.9
)
Foreign currency translation
    
(0.2
)
    
(0.6
)
Asset retirement obligation, end of period
  
$
20.8
    
$
23.8