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Asset retirement obligations - Additional Information (Details) - Greece € in Millions | 12 Months Ended
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Dec. 31, 2019 EUR (€)
50.0 million Letter of Credit |
Disclosure of Asset Retirement Obligations [line items] |
Letter of guarantee | € 50.0
Letter of guarantee expiration date | Jul. 26, 2026
Letter of guarantee annual fee | 2.22%
7.5 million Letter of Guarantee |
Disclosure of Asset Retirement Obligations [line items] |
Letter of guarantee | € 7.5
Letter of guarantee expiration date | Jul. 26, 2026
Letter of guarantee annual fee | 2.22%

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