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Accounting for Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2022
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of Asset Retirement Obligations

The following is a reconciliation of asset retirement obligations as of December 31, 2022 and 2021:

  
December 31,
  
(millions of dollars)
  
2022
    
2021
  
Asset retirement obligation, beginning of period
  
$
24.4
    
$
24.1
  
Accretion expense
    
1.5
      
1.9
  
Other
    
1.4
      
1.2
  
Payments
    
(2.9
)
    
(2.3
)
Foreign currency translation
    
(0.6
)
    
(0.5
)
Asset retirement obligation, end of period
  
$
23.8
    
$
24.4