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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2019
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS [Abstract]  
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
MINERALS TECHNOLOGIES INC. & SUBSIDIARY COMPANIES
SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
(millions of dollars)

Description
  
Balance at
Beginning of Period
    
Additions Charged to Costs,
Provisions and Expenses
    
Deductions (a)
    
Balance at
End of Period
  
Year Ended December 31, 2019
                        
Valuation and qualifying accounts deducted from assets to which they apply:
                        
Allowance for doubtful accounts
  
$
3.2
      
6.3
      
3.4
    
$
12.9
  
Year Ended December 31, 2018
                                
Valuation and qualifying accounts deducted from assets to which they apply:
                                
Allowance for doubtful accounts
  
$
4.2
      
3.2
      
(4.2
)
  
$
3.2
  
Year Ended December 31, 2017
                                
Valuation and qualifying accounts deducted from assets to which they apply:
                                
Allowance for doubtful accounts
  
$
7.9
      
3.8
      
(7.5
)
  
$
4.2
  

(a)
Includes impact of write-offs, translation of foreign currencies and reclassifications for presentation purposes.