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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated Other Comprehensive Income (Loss)

Accumulated other comprehensive income (loss) at December 31 comprised of the following components:

 
December 31,
  
(millions of dollars)
  
2024
    
2023
  
Cumulative foreign currency translation
  
$
(399.6
)
  
$
(350.9
)
Unrecognized pension benefit (costs) (net of tax (expense) benefit of $(1.2) in 2024 and $8.9 in 2023)
    
1.9
      
(28.8
)
Unrealized gain on cash flow hedges (net of tax expense (benefit) of $0.1 in 2024 and $(1.2) in 2023)
    
10.6
      
10.3
  
   
$
(387.1
)
  
$
(369.4
)
Changes in Other Comprehensive Income (Loss) by Component

The following table summarizes the changes in other comprehensive income (loss) by component:

 
Year Ended December 31,
  
   
2024
    
2023
    
2022
  
(millions of dollars)
  
Pre-Tax
Amount
    
Tax
(Expense)
Benefit
    
Net-of-
Tax
Amount
    
Pre-Tax
Amount
    
Tax
(Expense)
Benefit
    
Net-of-
Tax
Amount
    
Pre-Tax
Amount
    
Tax
(Expense)
Benefit
    
Net-of-
Tax
Amount
  
Foreign currency translation adjustment
  
$
(49.9
)
  
$
—
    
$
(49.9
)
  
$
(6.1
)
  
$
—
    
$
(6.1
)
  
$
(78.9
)
  
$
—
    
$
(78.9
)
                                                                         
Pension plans:
                                                                        
Net actuarial gains (losses) and prior service costs arising during the period
    
39.5
      
(9.7
)
    
29.8
      
5.1
      
(1.4
)
    
3.7
      
41.4
      
(9.8
)
    
31.6
  
Amortization of net actuarial (gains) losses and prior service costs
    
1.1
      
(0.3
)
    
0.8
      
2.5
      
(0.6
)
    
1.9
      
4.9
      
(1.2
)
    
3.7
  
                                                                         
Unrealized gains (losses) on cash flow hedges
    
0.4
      
(0.1
)
    
0.3
      
(4.5
)
    
1.2
      
(3.3
)
    
10.6
      
(2.8
)
    
7.8
  
                                                                         
Total other comprehensive income (loss)
  
$
(8.9
)
  
$
(10.1
)
  
$
(19.0
)
  
$
(3.0
)
  
$
(0.8
)
  
$
(3.8
)
  
$
(22.0
)
  
$
(13.8
)
  
$
(35.8
)