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Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2016
Discontinued Operations [Abstract]  
Selected financial information
The following table provides selected financial information for the amounts included within discontinued operations in the Consolidated Statements of Income.
 
    
Year Ended December 31,
 
2016
  
2015
  
2014
 
  
(millions of dollars)
 
Net sales
 
$
-
  
$
-
  
$
-
 
             
Production margin
  
-
   
-
   
-
 
Expenses
  
-
   
-
   
(0.3
)
Facility closure costs accrual (reversal)
  
-
   
-
   
(2.4
)
             
Income from operations
 
$
-
  
$
-
  
$
2.7
 
             
Provision for taxes on income
 
$
-
  
$
-
  
$
0.6
 
             
Income from discontinued operations, net of tax
 
$
-
  
$
-
  
$
2.1