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Accounting for Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting for Asset Retirement Obligations [Abstract]  
Reconciliation of Asset Retirement Obligations

The following is a reconciliation of asset retirement obligations as of December 31, 2021 and 2020:

  
December 31,
  
(millions of dollars)
  
2021
    
2020
  
Asset retirement obligation, beginning of period
  
$
24.1
    
$
23.9
  
Accretion expense
    
1.9
      
2.3
  
Other
    
1.2
      
1.1
  
Payments
    
(2.3
)
    
(3.4
)
Foreign currency translation
    
(0.5
)
    
0.2
  
Asset retirement obligation, end of period
  
$
24.4
    
$
24.1