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Principles of consolidation (Tables) | 12 Months Ended
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Dec. 31, 2017
Principles Of Consolidation |
Disclosure of effect of changes in foreign exchange rates [text block] | The main foreign exchange rates used to translate the financial statements into the parent’s functional currency are indicated below:
(currency amount for €1) |  | Annual average exchange rate 2017 |  | Exchange rate at December 31, 2017 |  | Annual average exchange rate 2016 |  | Exchange rate at December 31, 2016 |  | Annual average exchange rate 2015 |  | Exchange rate at December 31, 2015
U.S. Dollar |  |  | 1.13 |  |  |  | 1.20 |  |  |  | 1.11 |  |  |  | 1.05 |  |  |  | 1.11 |  |  |  | 1.09 |
Pound Sterling |  |  | 0.88 |  |  |  | 0.89 |  |  |  | 0.82 |  |  |  | 0.86 |  |  |  | 0.73 |  |  |  | 0.73 |
Norwegian Krone |  |  | 9.33 |  |  |  | 9.83 |  |  |  | 9.29 |  |  |  | 9.09 |  |  |  | 8.95 |  |  |  | 9.60 |
Australian Dollar |  |  | 1.47 |  |  |  | 1.53 |  |  |  | 1.49 |  |  |  | 1.46 |  |  |  | 1.48 |  |  |  | 1.49 |

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- Definition The entire disclosure for the effect of changes in foreign exchange rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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