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Note 18 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of inventory components [text block]
      2018       2017  
                 
Finished goods    
1,688.0
      
1,528.4
  
Work in progress    
339.5
      
309.6
  
Raw material    
2,517.3
      
1,816.3
  
Consumables    
107.0
      
77.3
  
Spare parts and other    
597.0
      
476.9
  
Prepayments    
304.4
      
210.9
  
Impairment losses    
(151.4
 )    
(100.4
 )
     
5,401.8
      
4,319.0