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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated other comprehensive income (loss), net of related tax
Accumulated other comprehensive income (loss) at December 31 comprised of the following components:

  
2016
  
2015
 
 (millions of dollars) 
Cumulative foreign currency translation
 
$
(147.3
)
 
$
(108.7
)
Unrecognized pension costs (net of tax benefit of $39.4 in 2016 and $38.7 in 2015)
  
(78.0
)
  
(74.8
)
Unrealized gain (loss) on cash flow hedges (net of tax expense of $1.8 in 2016 and $1.0 in 2015)
  
4.2
   
2.6
 
  
$
(221.1
)
 
$
(180.9
)
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,
 
  
2016
  
2015
 
  
Pre-Tax
Amount
  
Tax
(Expense)
Benefit
  
Net-of-
Tax
Amount
  
Pre-Tax
Amount
  
Tax
(Expense)
Benefit
  
Net-of-
Tax
Amount
 
  
(millions of dollars)
 
Foreign currency translation adjustment
  
(40.2
)
  
-
  
$
(40.2
)
  
(76.6
)
  
-
  
$
(76.6
)
                         
Pension plans:
                        
Net actuarial gains (losses) and prior service costs arising during the period
  
(12.5
)
  
4.1
   
(8.4
)
  
0.5
   
0.5
   
1.0
 
Amortization of net actuarial (gains) losses and prior service costs
  
8.0
   
(2.8
)
  
5.2
   
9.6
   
(3.3
)
  
6.3
 
                         
Unrealized gains (losses) on cash flow hedges
  
2.4
   
(0.8
)
  
1.6
    -    -    - 
                         
Total other comprehensive income (loss)
 
$
(42.3
)
 
$
0.5
  
$
(41.8
)
 
$
(66.5
)
 
$
(2.8
)
 
$
(69.3
)