Post Retirement Benefits - Summary of Post Retirement Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Post-retirement benefits	$ 31.7	$ 36.1
Medical benefits plan Brazil [member]
Disclosure of defined benefit plans [line items]
Post-retirement benefits	27.9	31.8
Medical benefits plan subsidiaries abroad [member]
Disclosure of defined benefit plans [line items]
Post-retirement benefits	$ 3.8	$ 4.3

The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 5
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_5&doctype=Standard
-URIDate 2018-03-16

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