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Organization and principal activities - Narrative (Details) | Jun. 30, 2018 service_company facility holding_company sales_company
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Disclosure of detailed information about business combination [line items] |
Number of wholly owned production facilities | 12
Number of sales companies | sales_company | 3
Number of holding companies | holding_company | 10
Number of service companies | service_company | 2
Portugal and France |
Disclosure of detailed information about business combination [line items] |
Number of former operating entities in dissolution | 2
Germany |
Disclosure of detailed information about business combination [line items] |
Number of production facilities operating as a joint venture | 1

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