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Disclosures on equity (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 27, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 21, 2018 | Aug. 22, 2018 | May 23, 2018 | May 10, 2018
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Provisional dividend payable per share |  |  |  |  |  |  |  | $ 0.41968
debt equity ratio |  | 1.2 |  |  |  |  |  |
Actuarial assumption of discount rates |  | 4.642% | 5.114% | 4.522% |  |  |  |
Dividend payable per share | $ 1.62501 |  |  |  | $ 0.31726 | $ 0.50864 | $ 0.43247 |
Provisional dividend paid, Per share |  |  | $ 1.20533 |  |  |  |  |
Dividends recognised as distributions to owners | $ 100,000,000 | $ 549,563,000 | $ 483,273,000 | $ 378,014,000 |  |  |  |
Dividends paid, ordinary shares per share | $ 0.37994 |  |  |  |  |  |  |
State defined benefit plans [member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Actuarial assumption of discount rates |  |  | 5.50% | 5.50% |  |  |  |
Series A preferred shares [Member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued and fully paid |  | 142,819,552 | 142,819,552 |  |  |  |  |
Series B preferred shares [Member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued and fully paid |  | 120,376,972 | 120,376,972 |  |  |  |  |
Preference shares [member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued and fully paid |  | 263,196,524 |  |  |  |  |  |
Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Cash dividend rate |  | 30.00% |  |  |  |  |  |

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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