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Asset Retirement Obligations - Additional Information (Detail) - Greece [member] € in Millions | 12 Months Ended
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Dec. 31, 2017 EUR (€)
50.0 million Letter of Credit [member] |
Disclosure of asset retirement obligations [line items] |
Letter of guarantee | € 50.0
Letter of guarantee annual fee | 0.57%
Letter of guarantee expiration date | Jul. 26, 2026
7.5 million Letter of Guarantee [member] |
Disclosure of asset retirement obligations [line items] |
Letter of guarantee | € 7.5
Letter of guarantee annual fee | 0.45%
Letter of guarantee expiration date | Jul. 26, 2026

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- Definition Letters of guarantee expiration date. + References No definition available. + Details
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- Details
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- Details
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- Details
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