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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Note 6.     Property, Plant and Equipment
Property, plant and equipment consists of the following:
 
(in millions)
   
2020
    
2019
  
Land
    $ 21.6     $ 19.8  
Buildings
      65.5       60.0  
Equipment
      349.9       330.7  
Work in progress
      27.5       19.0  
    
 
 
    
 
 
  
       464.5       429.5  
Less accumulated depreciation and impairment
      (253.7 )      (230.8 ) 
    
 
 
    
 
 
  
     $ 210.8     $ 198.7  
    
 
 
    
 
 
  
Of the total net book value of equipment at December 31, 2020 $1.0 million (2019 – $1.8 million) are in respect of assets held under finance leases.
Depreciation charges were $24.7 million, $23.6 million and $22.6 million in 2020, 2019 and 2018, respectively.
An impairment charge of $2.0 million was incurred in
2020
as a result of the Octane Additives segment ceasing to trade on June 30, 2020.