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Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2015
Discontinued Operations [Abstract]  
Selected financial information
The following table provides selected financial information for the Walsum plant included within discontinued operations in the Consolidated Statements of Income.  The amounts exclude general corporate overhead and interest expense which were previously allocated to the entity comprising the discontinued operations.

  
Year Ended December 31,
 
  
2015
  
2014
  
2013
 
  
(millions of dollars)
 
Net sales
 
$
-
  
$
-
  
$
1.6
 
             
Production margin
  
-
   
-
   
(2.1
)
             
Expenses (income)
  
-
   
(0.3
)
  
0.5
 
             
Facility closure costs accrual (reversal)
  
-
   
(2.4
)
  
5.9
 
             
Income (loss) from operations
 
$
-
  
$
2.7
  
$
(8.5
)
             
Provision for taxes on income
 
$
-
  
$
0.6
  
$
(2.7
)
             
Income (loss) from discontinued operations, net of tax
 
$
-
  
$
2.1
  
$
(5.8
)