Business Combinations - Total acquisition consideration (Details)	1 Months Ended
Feb. 28, 2018	Dec. 23, 2015
Globe Specialty Metals Inc
Acquisition-date fair value of total consideration transferred [abstract]
Percentage of equity interests acquired		100.00%
Glencore \| Major business combination
Acquisition-date fair value of total consideration transferred [abstract]
Period for marketing and procurement of manganese ores	10 years

The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_c&doctype=Appendix&seq=2
-URIDate 2018-03-16

Name:	ifrs-full_PercentageOfVotingEquityInterestsAcquired
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant