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Risk Management Activities - Market Risk - Foreign Currency - Additional Information (Detail) $ in Millions, $ in Millions |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) $ / USD | Oct. 31, 2018 USD ($) $ / USD | Sep. 30, 2018 USD ($) $ / USD | Jun. 30, 2018 USD ($) $ / USD | May 31, 2018 USD ($) $ / USD | Dec. 31, 2020 USD ($) | Dec. 31, 2020 AUD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 AUD ($) | Dec. 31, 2020 AUD ($) | Dec. 31, 2019 AUD ($)
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |
Term loan and revolving credit facility |  |  |  |  |  |  | $ 1,200.0 |  |  |  |  |
Average strike rate | 836.45 |  |  |  |  |  |  |  |  |  |  |
Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |
Exposure to risk relating to financial instruments |  |  |  |  |  |  | 0.0 |  |  |  |  |
Currency risk [member] | AUSTRALIA |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |
Average strike rate | $ / USD |  | 0.715 | 0.7075 | 0.7182 | 0.7330 | 0.7517 |  |  |  |  |  |
Currency risk [member] | Forward contract [member] | Salares Nortes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |
Term loan and revolving credit facility | $ 544.5 |  |  |  |  |  |  |  |  |  |  |
Mark to Market value |  |  |  |  |  |  | 86.0 |  | $ 0.0 |  |  |
Gains (losses) on ineffectiveness of hedges of net investments in foreign operations recognised in profit or loss |  |  |  |  |  |  | 5.2 |  | 0.0 |  |  |
Hedging instrument, liabilities |  |  |  |  |  |  | 86.0 |  | 0.0 |  |  |
Unrealized Gain (loss) on hedge ineffectiveness |  |  |  |  |  |  | 86.0 |  | 0.0 |  |  |
Currency risk [member] | Forward contract [member] | AUSTRALIA |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |
Term loan and revolving credit facility |  | $ 50.0 | $ 60.0 | $ 100.0 | $ 60.0 | $ 96.0 |  |  |  |  |  |
Mark to Market value |  |  |  |  |  |  | 0.0 |  | 0.3 |  | $ 0.0 | $ 0.4
Gains (losses) on ineffectiveness of hedges of net investments in foreign operations recognised in profit or loss |  |  |  |  |  |  | 0.3 | $ 0.4 | 15.5 | $ 22.3 |  |
Hedging instrument, liabilities |  |  |  |  |  |  | 0.0 |  | 0.3 |  | $ 0.0 | $ 0.4
Unrealized Gain (loss) on hedge ineffectiveness |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 8.3 | $ 11.9 |  |

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