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Note 18 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of inventory components [text block]
    2017     2016  
             
Finished goods    
1,528.4
      
1,445.5
  
Work in progress    
309.6
      
328.5
  
Raw material    
1,816.3
      
1,962.7
  
Consumables    
77.3
      
50.0
  
Spare parts and other    
476.9
      
447.2
  
Prepayments    
210.9
      
234.5
  
Impairment losses    
(100.4
 )    
(121.3
 )
     
4,319.0
      
4,347.1