Finance costs (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Borrowing costs [abstract]
Finance costs before capitalized interest	$ 127,282	$ 95,631
Less capitalized interest related to Geismar plant under construction	(2,856)	(1,215)
Finance costs	$ 124,426	$ 94,416

The amount of costs associated with financing activities of the entity.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 82
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_82_b&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_FinanceCosts
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration