Other disclosures - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Other Disclosures [Line Items]
Capital commitments	$ 3,059.0	$ 3,152.0
Contractual capital commitments	1,700.0	1,500.0
Contingent liabilities indemnities and other performance guarantees	140.0	146.0
Contractual payments	10.5
Joint ventures
Other Disclosures [Line Items]
Capital commitments	$ 9.0	$ 9.0

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2020-01-01
-Paragraph 86
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_86_a&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_EstimatedFinancialEffectOfContingentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant