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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated Other Comprehensive Loss, Net of Related Tax, Attributable to MTI
Accumulated other comprehensive income (loss) at December 31 comprised of the following components:

  
December 31,
 
(millions of dollars)
 
2018
  
2017
 
Cumulative foreign currency translation
 
$
(170.1
)
 
$
(104.1
)
Unrecognized pension costs (net of tax benefit of $25.5 in 2018 and $30.7 in 2017)
  
(69.7
)
  
(86.5
)
Unrealized gain (loss) on cash flow hedges (net of tax expense of $0.3 in 2018 and $0.7 in 2017)
  
6.1
   
4.5
 
  
$
(233.7
)
 
$
(186.1
)
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,
 
  
2018
  
2017
  
2016
 
(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
 
$
(67.9
)
 
$
—
  
$
(67.9
)
 
$
44.7
  
$
—
  
$
44.7
  
$
(40.2
)
 
$
—
  
$
(40.2
)
                                     
Pension plans:
                                    
Net actuarial gains (losses) and prior service costs arising during the period
  
9.6
   
(1.8
)
  
7.8
   
(17.6
)
  
4.4
   
(13.2
)
  
(12.5
)
  
4.1
   
(8.4
)
Amortization of net actuarial (gains) losses and prior service costs
  
12.1
   
(3.0
)
  
9.1
   
7.6
   
(2.9
)
  
4.7
   
8.0
   
(2.8
)
  
5.2
 
                                     
Unrealized gains (losses) on cash flow hedges
  
1.5
   
0.1
   
1.6
   
0.2
   
0.1
   
0.3
   
2.4
   
(0.8
)
  
1.6
 
                                     
Total other comprehensive income (loss)
 
$
(44.7
)
 
$
(4.7
)
 
$
(49.4
)
 
$
34.9
  
$
1.6
  
$
36.5
  
$
(42.3
)
 
$
0.5
  
$
(41.8
)