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Note 23 - Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of net defined benefit liability (asset) [text block]
      2018       2017       2016  
Present value of funded obligations    
(5,161.0
 )    
(5,027.7
 )    
(4,592.1
 )
Fair value of plan assets    
4,059.6
      
4,006.2
      
3,845.2
  
Present value of net funded obligations    
(1,101.4
 )    
(1,021.5
 )    
(746.9
 )
Present value of unfunded obligations    
(790.9
 )    
(757.4
 )    
(741.3
 )
Present value of net obligations    
(1,892.3
 )    
(1,778.9
 )    
(1,488.2
 )
Asset ceiling    
(298.3
 )    
(368.4
 )    
(532.2
 )
Net liability    
(2,190.6
 )    
(2,147.3
 )    
(2,020.4
 )
Other long term employee benefits    
(88.7
 )    
(105.0
 )    
(83.8
 )
Total employee benefits    
(2,279.3
 )    
(2,252.3
 )    
(2,104.2
 )
Employee benefits amount in the balance sheet:                        
Liabilities    
(2,343.6
 )    
(2,310.7
 )    
(2,137.7
 )
Assets    
64.3
      
58.4
      
33.5
  
Net liabilities    
(2,279.3
 )    
(2,252.3
 )    
(2,104.2
 )
Disclosure of defined benefit obligation [text block]
      2018       2017       2016  
Defined benefit obligation at January 1
st
    
(5,785.1
 )    
(5,333.4
 )    
(5,403.0
 )
Acquisitions through exchange transaction of shareholdings    
3.5
      
–
      
(67.3
 )
Service cost    
(42.5
 )    
(38.2
 )    
(43.1
 )
Interest cost    
(335.7
 )    
(321.5
 )    
(320.5
 )
Gains and (losses) on settlements or reductions in benefits    
7.0
      
3.9
      
2.2
  
Contributions by plan participants    
(4.4
 )    
(4.1
 )    
(5.2
 )
Actuarial gains and (losses) - geographical assumptions    
9.9
      
77.3
      
(20.1
 )
Actuarial gains and (losses) - financial assumptions    
(13.1
 )    
(140.3
 )    
(321.1
 )
Experience adjustment    
106.4
      
(115.7
 )    
(182.8
 )
Reclassifications    
–
      
(7.5
 )    
11.1
  
Effect of exchange rate fluctuations    
(321.0
 )    
(306.5
 )    
599.6
  
Benefits paid    
423.1
      
400.9
      
416.8
  
Defined benefit obligation at December, 31    
(5,951.9
 )    
(5,785.1
 )    
(5,333.4
 )
Disclosure of the change in fair value of the plan assets [text block]
      2018       2017       2016  
Fair value of plan assets at January 1
st
    
4,006.2
      
3,845.2
      
3,781.4
  
Interest Income    
267.8
      
273.3
      
274.7
  
Administrative costs    
(3.8
 )    
(3.4
 )    
(3.7
 )
Expected Return excluding interest income    
(168.8
 )    
(64.8
 )    
269.8
  
Acquisition through business combination    
–
      
–
      
73.5
  
Contributions by employer    
213.3
      
183.2
      
175.9
  
Contributions by plan participants    
4.7
      
4.5
      
5.6
  
Exchange differences    
170.6
      
166.8
      
(315.3
 )
Curtailments, settlements and others    
(8.0
 )    
–
      
–
  
Benefits paid excluding costs of administration    
(422.4
 )    
(398.6
 )    
(416.7
 )
Fair value of plan assets at December, 31    
4,059.6
      
4,006.2
      
3,845.2
  
Disclosure of asset ceiling [text block] <div style="display: inline; font-family: times new roman; font-size: 10pt"><table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; min-; min-width: 700px;"> <tr style="vertical-align: bottom; background-color: White"> <td style="color: Black; padding-bottom: 1pt"> </td> <td style="color: Black; font-weight: bold"> </td> <td style="border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: right">2018</td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: left"> </td> <td style="color: Black; font-weight: bold; border-bottom: Black 1pt solid"> </td> <td style="border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: right">2017</td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: left"> </td> <td style="color: Black; font-weight: bold; border-bottom: Black 1pt solid"> </td> <td style="border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: right">2016</td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; color: Black; font-weight: bold; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="width: 61%; color: Black; font-weight: bold; text-align: left"><div style="display: inline; font-family: Times New Roman, Times, Serif; font-size: 10pt; color: Black"><div style="display: inline; font-weight: bold;">Asset ceiling impact at January 1 <div style="display: inline; bottom:.33em; font-size: 82%; position: relative; vertical-align: baseline;">st</div></div></div></td> <td style="width: 1%; color: Black; font-weight: bold"> </td> <td style="width: 1%; color: Black; font-weight: bold; text-align: left"> </td> <td style="width: 10%; color: Black; font-weight: bold; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">58.4</div></td> <td style="white-space: nowrap; width: 1%; color: Black; font-weight: bold; text-align: left"> </td> <td style="width: 1%; color: Black; font-weight: bold"> </td> <td style="width: 1%; color: Black; font-weight: bold; text-align: left"> </td> <td style="width: 10%; color: Black; font-weight: bold; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">33.5</div></td> <td style="white-space: nowrap; width: 1%; color: Black; font-weight: bold; text-align: left"> </td> <td style="width: 1%; color: Black; font-weight: bold"> </td> <td style="width: 1%; color: Black; font-weight: bold; text-align: left"> </td> <td style="width: 10%; color: Black; font-weight: bold; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">8.6</div></td> <td style="white-space: nowrap; width: 1%; color: Black; font-weight: bold; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="color: Black; text-align: left">Acquisitions through exchange transaction of shareholdings</td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">(4.9</div></td> <td style="white-space: nowrap; color: Black; text-align: left">)</td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">–</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">10.4</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="color: Black; text-align: left">Interest income/(expenses)</td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">4.2</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2.8</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">1.3</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="color: Black; text-align: left">Change in asset ceiling excluding amounts included in interest income/(expenses)</td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">(0.6</div></td> <td style="white-space: nowrap; color: Black; text-align: left">)</td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">8.8</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">15.8</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="color: Black; text-align: left">Effect of exchange rate fluctuations</td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">7.2</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">0.9</div></td> <td style="white-space: nowrap; color: Black; text-align: left"> </td> <td style="color: Black"> </td> <td style="color: Black; text-align: left"> </td> <td style="color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">(2.6</div></td> <td style="white-space: nowrap; color: Black; text-align: left">)</td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="color: Black; padding-bottom: 1pt">Others</td> <td style="color: Black"> </td> <td style="border-bottom: Black 1pt solid; color: Black; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">–</div></td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; color: Black; text-align: left"> </td> <td style="color: Black; border-bottom: Black 1pt solid"> </td> <td style="border-bottom: Black 1pt solid; color: Black; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">12.4</div></td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; color: Black; text-align: left"> </td> <td style="color: Black; border-bottom: Black 1pt solid"> </td> <td style="border-bottom: Black 1pt solid; color: Black; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; color: Black; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">–</div></td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; color: Black; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="color: Black; font-weight: bold; text-align: left">Asset ceiling impact at December 31</td> <td style="color: Black; font-weight: bold"> </td> <td style="color: Black; font-weight: bold; text-align: left"> </td> <td style="color: Black; font-weight: bold; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">64.3</div></td> <td style="white-space: nowrap; color: Black; font-weight: bold; text-align: left"> </td> <td style="color: Black; font-weight: bold"> </td> <td style="color: Black; font-weight: bold; text-align: left"> </td> <td style="color: Black; font-weight: bold; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">58.4</div></td> <td style="white-space: nowrap; color: Black; font-weight: bold; text-align: left"> </td> <td style="color: Black; font-weight: bold"> </td> <td style="color: Black; font-weight: bold; text-align: left"> </td> <td style="color: Black; font-weight: bold; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">33.5</div></td> <td style="white-space: nowrap; color: Black; font-weight: bold; text-align: left"> </td> </tr> </table></div>
Disclosure of defined benefit plans recognized in the income statement [text block]
      2018       2017       2016  
Current service costs    
(42.5
 )    
(38.2
 )    
(43.1
 )
Administrative costs    
(3.8
 )    
(3.4
 )    
(3.7
 )
(Gains) losses on settlements and curtailments    
7.3
      
4.2
      
0.7
  
Income from operations    
(39.0
 )    
(37.4
 )    
(46.1
 )
Financial cost    
(103.0
 )    
(101.3
 )    
(105.6
 )
Total expense for employee benefits    
(142.0
 )    
(138.7
 )    
(151.7
 )
Disclosure of employee benefit revenue (expenses) allocation in income statement [text block]
      2018       2017       2016  
Cost of sales    
(19.2
 )    
(22.3
 )    
(24.5
 )
Sales and marketing expenses    
(8.8
 )    
(5.0
 )    
(9.5
 )
Administrative expense    
(11.0
 )    
(10.1
 )    
(10.2
 )
Financial expenses    
(103.0
 )    
(101.3
 )    
(105.6
 )
Exceptional items    
–
      
–
      
(1.9
 )
     
(142.0
 )    
(138.7
 )    
(151.7
 )
Disclosure of actuarial assumptions of the entity [text block]
      2018(i)       2017(i)       2016(i)  
Discount rate  
3.9%
to
9.6%
  
3.6%
to
10.6%
  
3.9%
to
10.5%
Inflation  
2.0%
to
4.0%
  
2.0%
to
5.0%
  
2.0%
to
5.2%
Future salary increases  
1.0%
to
7.1%
  
1.0%
to
8.7%
  
1.0%
to
8.5%
Future pension increases  
2.0%
to
4.0%
  
2.0%
to
4.3%
  
2.0%
to
4.5%
Medical cost trend rate  
4.5%
to
7.9% p.a.

reducing to
7.9%		  
4.5%
to
7.9% p.a.

reducing to
7.9%		  
3.8%
to
8.2% p.a.

reducing to
8.2%
Dental claims trend rate  
 
4.0%
 
  
 
4.3%
 
  
 
4.5%
 
                         
Life expectation for an over 65 years old male  
83
  to
87
 
 83
to
87
 
 80
to
86  
Life expectation for an over 65 years old female  
85
to
89
  
86
to
89
 
83
  to
89  
Disclosure of sensitivity analysis for actuarial assumptions [text block]
        2018   2017   2016
In million of Brazilian Reais   Change in assumption   Increase in
assumption		   Decrease in
assumption		   Increase in
assumption		   Decrease in
assumption		   Increase in
assumption		   Decrease in
assumption
Medical cost trend rate  
100 bases points
    
(113.8
 )    
98.0
      
(119.7
 )    
102.3
      
(104.7
 )    
90.2
  
Discount rate  
50 bases points
    
295.8
      
(314.4
 )    
289.7
      
(309.2
 )    
292.6
      
(311.5
 )
Future salary increase  
50 bases points
    
(24.2
 )    
23.0
      
(12.9
 )    
12.3
      
(16.6
 )    
15.3
  
Longevity  
One year
    
(177.8
 )    
174.0
      
(180.6
 )    
176.5
      
(175.9
 )    
172.9
  
Disclosure of plan assets components [text block]
    2018   2017   2016
    Rated   Unrated   Total   Rated   Unrated   Total   Rated   Unrated   Total
Government bonds    
50
 %     –      
50
 %    
50
 %     –      
50
 %    
41
 %     –      
41
 %
Corporate bonds    
7
 %     –      
7
 %    
7
 %     –      
7
 %    
13
 %     –      
13
 %
Equity instruments    
14
 %     –      
14
 %    
14
 %     –      
14
 %    
18
 %     –      
18
 %
Cash    
–
       –      
–
      
–
       –      
–
      
1
 %     –      
1
 %
Others    
29
 %     –      
29
 %    
29
 %     –      
29
 %    
27
 %     –      
27
 %