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Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2018
Comprehensive Income [Abstract]  
Reclassifications Out of Accumulated Other Comprehensive Loss, Net of Related Tax
The following table summarizes the amounts reclassified out of accumulated other comprehensive loss attributable to the Company:

  
Three Months Ended
  
Nine Months Ended
 
 (millions of dollars)
 
Sep. 30,
2018
  
Oct. 1,
2017
  
Sep. 30,
2018
  
Oct. 1,
2017
 
    
Amortization of pension items:
            
Pre-tax amount
 
$
6.2
  
$
1.7
  
$
11.1
  
$
5.5
 
Tax
  
(1.6
)
  
(0.7
)
  
(2.7
)
  
(1.8
)
Net of tax
 
$
4.6
  
$
1.0
  
$
8.4
  
$
3.7
 
Accumulated Other Comprehensive Loss, Net of Related Tax, Attributable to MTI
The major components of accumulated other comprehensive loss, net of related tax, attributable to MTI are as follows:

 (millions of dollars)
 
Foreign Currency
Translation Adjustment
  
Unrecognized
Pension Costs
  
Net Gain (Loss)
on Derivatives
  
Total
 
    
Balance as of December 31, 2017
 
$
(104.1
)
 
$
(86.5
)
 
$
4.5
  
$
(186.1
)
                 
Other comprehensive loss before reclassifications
  
(61.0
)
  
—
   
—
   
(61.0
)
Amounts reclassified from AOCI
  
—
   
8.4
   
(0.1
)
  
8.3
 
Net current period other comprehensive income (loss)
  
(61.0
)
  
8.4
   
(0.1
)
  
(52.7
)
Balance as of September 30, 2018
 
$
(165.1
)
 
$
(78.1
)
 
$
4.4
  
$
(238.8
)