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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated Other Comprehensive Loss, Net of Related Tax

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

  
December 31,
  
(millions of dollars)
  
2020
    
2019
  
Cumulative foreign currency translation
  
$
(190.8
)
  
$
(200.2
)
Unrecognized pension costs (net of tax benefit of $64.6 in 2020 and $30.5 in 2019)
    
(114.9
)
    
(96.1
)
Unrealized gain (loss) on cash flow hedges (net of tax (benefit) expense of $(3.1) in 2020 and $0.3 in 2019)
    
(2.6
)
    
5.9
  
   
$
(308.3
)
  
$
(290.4
)
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,
  
   
2020
    
2019
    
2018
  
(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
  
$
10.9
    
$
—
    
$
10.9
    
$
(29.9
)
  
$
—
    
$
(29.9
)
  
$
(67.9
)
  
$
—
    
$
(67.9
)
                                                                         
Pension plans:
                                                                        
Net actuarial gains (losses) and prior service costs arising during the period
    
(37.9
)
    
9.2
      
(28.7
)
    
(30.6
)
    
7.4
      
(23.2
)
    
9.6
      
(1.8
)
    
7.8
  
Amortization of net actuarial (gains) losses and prior service costs
    
13.4
      
(3.4
)
    
10.0
      
9.4
      
(2.3
)
    
7.1
      
12.1
      
(3.0
)
    
9.1
  
                                                                         
Unrealized gains (losses) on cash flow hedges
    
(11.6
)
    
3.1
      
(8.5
)
    
0.3
      
(0.1
)
    
0.2
      
1.5
      
0.1
      
1.6
  
                                                                         
Total other comprehensive income (loss)
  
$
(25.2
)
  
$
8.9
    
$
(16.3
)
  
$
(50.8
)
  
$
5.0
    
$
(45.8
)
  
$
(44.7
)
  
$
(4.7
)
  
$
(49.4
)