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Asset retirement obligations - Additional Information (Details) - Greece € in Millions	12 Months Ended
	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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- Definition

Disclosure of asset retirement obligations [Line Items]

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- Definition

Letters of Guarantee.

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No definition available.

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- Definition

Letters of guarantee annual fee.

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- Definition

Letters of Guarantee Expiration Date.

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- Details

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