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Risk Management Activities - Summary of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Value Of Reasonably Possible Decrease In Chilean Peso Exchange Rate By Fifeteen Percent [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | $ 74.2 |
Value Of Reasonably Possible Decrease In Forward Price By Ten Percent [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 49.5 |
Value Of Reasonably Possible Decrease In Chilean Peso Exchange Rate By Five Percent [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 24.7 |
Value Of Reasonably Possible Increase In Chilean Peso Exchange Rate By Five Percent [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (24.7) |
Value Of Reasonably Possible Increase In Chilean Peso Exchange Rate By Ten Percent [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (49.5) |
Value Of Reasonably Possible Increase In Chilean Peso Exchange Rate By Fifeteen Percent [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (74.2) |
Percentage Of Reasonably Possible Decrease In Interest Rates (1.5%) [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (5.2) | $ 5.9
Percentage Of Reasonably Possible Decrease In Interest Rates (1.5%) [Member] | Currency risk [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (7.3) |
Percentage Of Reasonably Possible Decrease In Interest Rates (1.0%) [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (2.9) | 4.0
Percentage Of Reasonably Possible Decrease In Interest Rates (1.0%) [Member] | Currency risk [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (4.8) |
Percentage Of Reasonably Possible Decrease In Interest Rates (0.5%) [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (0.8) | 2.0
Percentage Of Reasonably Possible Decrease In Interest Rates (0.5%) [Member] | Currency risk [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (2.4) |
Percentage Of Reasonably Possible Increase in Interest Rates 0.5% [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 3.0 | (2.1)
Percentage Of Reasonably Possible Increase in Interest Rates 0.5% [Member] | Currency risk [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 2.4 |
Percentage Of Reasonably Possible Increase In Interest Rates 1.0% [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 4.8 | (4.2)
Percentage Of Reasonably Possible Increase In Interest Rates 1.0% [Member] | Currency risk [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 4.8 |
Percentage Of Reasonably Possible Increase In Interest Rates 1.5% [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 6.4 | $ (6.3)
Percentage Of Reasonably Possible Increase In Interest Rates 1.5% [Member] | Currency risk [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | $ 7.1 |

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- Definition The amount of increase (decrease) in the fair value measurement of liabilities, recognised in profit or loss after tax, due to a reasonably possible increase in an unobservable input. [Refer: Tax income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2020-01-01 + Details
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