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Finance Expense - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement [line items] |  |  |  |
Borrowing costs | [1] | $ 13.2 | $ 43.4 | $ 17.5
Additions to property plant and equipment |  | 0.0 | 612.5 |
General Borrowings [Member] |  |  |  |
Statement [line items] |  |  |  |
Borrowing costs incurred |  | 13.2 | 31.0 |
Specific Borrowings [Member] |  |  |  |
Statement [line items] |  |  |  |
Borrowing costs incurred |  | 0.0 | 12.4 |
Gruyere [member] |  |  |  |
Statement [line items] |  |  |  |
Specific borrowings relates to related parties |  | $ 0.0 | $ 12.4 |
[1] | Borrowing costs capitalised of US$13.2 million (2019: US$43.4 million) comprise borrowing costs relating to general borrowings of US$13.2 million (2019: US$31.0 million) and specific borrowings of US$nil (2019: US$12.4 million). The specific borrowings of US$nil (2019: US$12.4 million) relate to the Gruyere project and are included in additions to property, plant and equipment of US$nil (2019: US$612.5 million) (refer note 14).

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