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Note 23 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of net defined benefit liability (asset) [text block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Present value of funded obligations |  |  | (5,027.7 | ) |  |  | (4,592.1 | ) |  |  | (4,646.4 | )
Fair value of plan assets |  |  | 4,006.2 |  |  |  | 3,845.2 |  |  |  | 3,781.4 |
Present value of net obligations |  |  | (1,021.5 | ) |  |  | (746.9 | ) |  |  | (865.0 | )
Present value of unfunded obligations |  |  | (757.4 | ) |  |  | (741.3 | ) |  |  | (756.6 | )
Present value of net obligations |  |  | (1,778.9 | ) |  |  | (1,488.2 | ) |  |  | (1,621.6 | )
Asset ceiling |  |  | (368.4 | ) |  |  | (532.2 | ) |  |  | (534.5 | )
Net liability |  |  | (2,147.3 | ) |  |  | (2,020.4 | ) |  |  | (2,156.1 | )
Other long term employee benefits |  |  | (105.0 | ) |  |  | (83.8 | ) |  |  | (57.2 | )
Total employee benefits |  |  | (2,252.3 | ) |  |  | (2,104.2 | ) |  |  | (2,213.3 | )
Employee benefits amount in the balance sheet: |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  | (2,310.7 | ) |  |  | (2,137.7 | ) |  |  | (2,221.9 | )
Assets |  |  | 58.4 |  |  |  | 33.5 |  |  |  | 8.6 |
Net liabilities |  |  | (2,252.3 | ) |  |  | (2,104.2 | ) |  |  | (2,213.3 | )
Disclosure of defined benefit obligation [text block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Defined benefit obligation at January 1 st |  |  | (5,333.4 | ) |  |  | (5,403.0 | ) |  |  | (4,808.0 | )
Acquisitions through exchange transaction of shareholdings |  |  | - |  |  |  | (67.3 | ) |  |  | - |
Service cost |  |  | (38.2 | ) |  |  | (43.1 | ) |  |  | (42.4 | )
Interest cost |  |  | (321.5 | ) |  |  | (320.5 | ) |  |  | (308.2 | )
Gains and (losses) on settlements or reductions in benefits |  |  | 3.9 |  |  |  | 2.2 |  |  |  | 1.1 |
Contributions by plan participants |  |  | (4.1 | ) |  |  | (5.2 | ) |  |  | (5.2 | )
Actuarial gains and (losses) - geographical assumptions |  |  | 77.3 |  |  |  | (20.1 | ) |  |  | - |
Actuarial gains and (losses) - financial assumptions |  |  | (140.3 | ) |  |  | (321.1 | ) |  |  | 182.5 |
Experience adjustment |  |  | (115.7 | ) |  |  | (182.8 | ) |  |  | (10.6 | )
Reclassifications |  |  | (7.5 | ) |  |  | 11.1 |  |  |  | - |
Exchange differences |  |  | (306.5 | ) |  |  | 599.6 |  |  |  | (805.1 | )
Benefits paid |  |  | 400.9 |  |  |  | 416.8 |  |  |  | 392.9 |
Defined benefit obligation at December, 31 |  |  | (5,785.1 | ) |  |  | (5,333.4 | ) |  |  | (5,403.0 | )
Disclosure of the change in fair value of the plan assets [text block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Fair value of plan assets at January 1 st |  |  | 3,845.2 |  |  |  | 3,781.4 |  |  |  | 3,550.1 |
Interest Income |  |  | 273.3 |  |  |  | 274.7 |  |  |  | 259.5 |
Administrative costs |  |  | (3.4 | ) |  |  | (3.7 | ) |  |  | (3.4 | )
Expected Return excluding interest income |  |  | (64.8 | ) |  |  | 269.8 |  |  |  | (173.2 | )
Acquisition through business combination |  |  | - |  |  |  | 73.5 |  |  |  | - |
Contributions by employer |  |  | 183.2 |  |  |  | 175.9 |  |  |  | 107.6 |
Contributions by plan participants |  |  | 4.5 |  |  |  | 5.6 |  |  |  | 5.2 |
Exchange differences |  |  | 166.8 |  |  |  | (315.3 | ) |  |  | 428.5 |
Benefits paid excluding costs of administration |  |  | (398.6 | ) |  |  | (416.7 | ) |  |  | (392.9 | )
Fair value of plan assets at December, 31 |  |  | 4,006.2 |  |  |  | 3,845.2 |  |  |  | 3,781.4 |
Disclosure of asset ceiling [text block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Asset ceiling impact at January 1 st |  |  | 33.5 |  |  |  | 8.6 |  |  |  | 12.8 |
Acquisitions through exchange transaction of shareholdings |  |  | - |  |  |  | 10.4 |  |  |  | - |
Interest income/(expenses) |  |  | 2.8 |  |  |  | 1.3 |  |  |  | 1.1 |
Change in asset ceiling excluding amounts included in interest income/(expenses) |  |  | 8.8 |  |  |  | 15.8 |  |  |  | (5.3 | )
Effect of exchange rate fluctuations |  |  | 0.9 |  |  |  | (2.6 | ) |  |  | - |
Others |  |  | 12.4 |  |  |  | - |  |  |  | - |
Asset ceiling impact at December 31 |  |  | 58.4 |  |  |  | 33.5 |  |  |  | 8.6 |
Disclosure of defined benefit plans recognized in the income statement [text block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Current service costs |  |  | (38.2 | ) |  |  | (43.1 | ) |  |  | (42.4 | )
Administrative costs |  |  | (3.4 | ) |  |  | (3.7 | ) |  |  | (3.4 | )
(Gains) losses on settlements and curtailments |  |  | 4.2 |  |  |  | 0.7 |  |  |  | 1.1 |
Income from operations |  |  | (37.4 | ) |  |  | (46.1 | ) |  |  | (44.7 | )
Financial cost |  |  | (101.3 | ) |  |  | (105.6 | ) |  |  | (97.6 | )
Total expense for employee benefits |  |  | (138.7 | ) |  |  | (151.7 | ) |  |  | (142.3 | )
Disclosure of employee benefit revenue (expenses) allocation in income statement [text block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Cost of sales |  |  | (22.3 | ) |  |  | (24.5 | ) |  |  | (19.3 | )
Sales and marketing expenses |  |  | (5.0 | ) |  |  | (9.5 | ) |  |  | (7.9 | )
Administrative expense |  |  | (10.1 | ) |  |  | (10.2 | ) |  |  | (17.5 | )
Financial expenses |  |  | (101.3 | ) |  |  | (105.6 | ) |  |  | (97.6 | )
Exceptional items |  |  | - |  |  |  | (1.9 | ) |  |  | - |
|  |  | (138.7 | ) |  |  | (151.7 | ) |  |  | (142.3 | )
Disclosure of actuarial assumptions of the entity [text block] |
|  | 2017 (i) |  | 2016 (i) |  | 2015 (i)
Discount rate |  | 3.6% | to | 10.6% |  | 3.9% | to | 10.5% |  | 4.1% | to | 12.1%
Inflation |  | 2.0% | to | 5.0% |  | 2.0% | to | 5.2% |  | 2.0% | to | 5.2%
Future salary increases |  | 1.0% | to | 8.7% |  | 1.0% | to | 8.5% |  | 1.0% | to | 8.8%
Future pension increases |  | 2.0% | to | 4.3% |  | 2.0% | to | 4.5% |  | 2.0% | to | 4.5%
Medical cost trend rate |  | 4.5% | to | 7.9% |  | 3.8% | a | 8.2% |  | 4.5% | to | 8.2%
|  | p.a. reducing to 7.9% |  | p.a. reducing to 8.2% |  | p.a. reducing to 8.2%
Dental claims trend rate |  |  | 4.3% |  |  |  | 4.5% |  |  |  | 4.5% |
Life expectation for an over 65 years old male |  | 83 | to | 87 |  | 80 | to | 86 |  | 85 | to | 70
Life expectation for an over 65 years old female |  | 86 | to | 89 |  | 83 | to | 89 |  | 88 | to | 71
Disclosure of sensitivity analysis for actuarial assumptions [text block] |
|  |  |  | 2017 |  |  | 2016 |  |  | 2015 |
In millions 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 |  |  | (119.7 | ) |  |  | 102.3 |  |  |  | (104.7 | ) |  |  | 90.2 |  |  |  | (77.5 | ) |  |  | 67.4 |
Discount rate |  | 50 bases points |  |  | 289.7 |  |  |  | (309.2 | ) |  |  | 292.6 |  |  |  | (311.5 | ) |  |  | 262.5 |  |  |  | (280.1 | )
Future salary increase |  | 50 bases points |  |  | (12.9 | ) |  |  | 12.3 |  |  |  | (16.6 | ) |  |  | 15.3 |  |  |  | (13.3 | ) |  |  | 12.5 |
Longevity |  | One year |  |  | (180.6 | ) |  |  | 176.5 |  |  |  | (175.9 | ) |  |  | 172.9 |  |  |  | (135.1 | ) |  |  | 131.1 |
Disclosure of plan assets components [text block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Rated |  |  | Unrated |  |  | Total |  |  | Rated |  |  | Unrated |  |  | Total |  |  | Rated |  |  | Unrated |  |  | Total |
Government bonds |  |  | 50 | % |  |  | - |  |  |  | 50 | % |  |  | 41 | % |  |  | - |  |  |  | 41 | % |  |  | 29 | % |  |  | - |  |  |  | 29 | %
Corporate bonds |  |  | 7 | % |  |  | - |  |  |  | 7 | % |  |  | 13 | % |  |  | - |  |  |  | 13 | % |  |  | 23 | % |  |  | - |  |  |  | 23 | %
Equity instruments |  |  | 14 | % |  |  | - |  |  |  | 14 | % |  |  | 18 | % |  |  | - |  |  |  | 18 | % |  |  | 15 | % |  |  | - |  |  |  | 15 | %
Property |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1 | % |  |  | 1 | %
Cash |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1 | % |  |  | - |  |  |  | 1 | % |  |  | - |  |  |  | - |  |  |  | - |
Others |  |  | 29 | % |  |  | - |  |  |  | 29 | % |  |  | 27 | % |  |  | - |  |  |  | 27 | % |  |  | 32 | % |  |  | - |  |  |  | 32 | %

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