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Revenue - Summary of Revenue from Contracts with Customers (Detail) - Impact of adopting IFRS 15 [member] - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Disclosure of disaggregation of revenue from contracts with customers [line items]

Revenue from contracts with customers

$ 2,577.8

$ 2,761.8

$ 2,666.4

Gold [member]

Disclosure of disaggregation of revenue from contracts with customers [line items]

Revenue from contracts with customers

^[1]

2,408.6

2,584.0

2,535.8

Copper [member]

Disclosure of disaggregation of revenue from contracts with customers [line items]

Revenue from contracts with customers

^[2]

$ 169.2

$ 177.8

$ 130.6

[1]	All regions.
[2]	Only Peru region (Cerro Corona).

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 113
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_113_a&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 114
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_114&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Details

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- Details

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