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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2014
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS [Abstract]  
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
(millions of dollars)

Description
 
Balance at Beginning of Period
  
Additions Charged to Costs, Provisions and Expenses
(b)
  
Deductions (a)
  
Balance at End of Period
 
Year ended December 31, 2014
        
Valuation and qualifying accounts deducted from assets to which they apply:
        
Allowance for doubtful accounts  
 
$
1.7
   
2.4
   
(0.5
)
  
3.6
 
                 
Year ended December 31, 2013
                
Valuation and qualifying accounts deducted from assets to which they apply:
                
Allowance for doubtful accounts  
 
$
3.8
  
$
0.6
   
(2.7
)
  
1.7
 
                 
Year ended December 31, 2012
                
Valuation and qualifying accounts deducted from assets to which they apply:
                
Allowance for doubtful accounts  
 
$
3.0
  
$
1.0
  
$
(0.2
)
  
3.8