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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Detail) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016
Disclosure of equity-accounted investees [line items] |  |  |  |
Non-current assets | $ 5,713.0 | $ 5,460.2 |  |
Current assets | 1,730.4 | 1,069.9 |  |
Non-current liabilities | (2,728.1) | (2,284.8) |  |
Current liabilities | (916.5) | (1,367.8) |  |
Consideration paid for equity portion |  |  | $ 165.0 |
Gain on acquisition | 0.0 | 0.0 | 51.8 |
Carrying amount of interest in joint venture | 233.3 | 172.0 |  |
Revenue | 3,892.1 | 2,967.1 | 2,577.8 |
Total equity-accounted investees | 233.3 | 172.0 |  |
Total share of results of equity-accounted investees after taxation | (2.6) | 3.1 | (13.1) |
Depreciation and amortisation | (661.3) | (610.0) | (668.4) |
Other expenses | (11.5) | (67.6) | (44.8) |
Royalties | (105.0) | (73.7) | (62.5) |
Profit for the year before impairment | 745.4 | 174.7 | (344.8) |
Profit on disposal | (0.2) | 1.2 | $ (51.6) |
FSE [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Share of accumulated losses brought forward | (93.6) | (92.2) |  |
Carrying amount of interest in joint venture | $ 144.4 | $ 82.1 |  |
Interest on joint venture | 40.00% | 40.00% | 40.00% |
Total share of results of equity-accounted investees after taxation | $ (1.6) | $ (1.4) | $ (12.9) |
Asanko Gold [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Non-current assets | 392.9 | 474.6 |  |
Initial investment at cost | 86.9 | 86.9 |  |
Current assets | 170.6 | 120.0 |  |
Non-current liabilities | (71.8) | (79.4) |  |
Current liabilities | (109.7) | (62.2) |  |
Net assets | 382.0 | 453.0 |  |
Less: Shika redeemable preference shares | (196.4) | (271.4) |  |
Net assets attributable to owners of the parent | 185.6 | 181.6 |  |
Group's share of net assets | 88.9 | 89.9 |  |
Cash consideration paid | 165.0 | 165.0 |  |
Less: consideration allocated to the redeemable preference shares | (129.9) | (129.9) |  |
Consideration paid for equity portion | 35.1 | 35.1 |  |
Gain on acquisition | 51.8 | 51.8 |  |
Share of accumulated losses brought forward | 3.0 | (1.1) |  |
Share of profit after taxation before impairment | 48.5 | 4.1 |  |
Impairment | (49.5) |  |  |
Carrying amount of interest in joint venture | 88.9 | 89.9 |  |
Revenue | 418.1 | 341.0 |  |
Production costs | (222.5) | (199.2) |  |
Asanko Gold - earnings | 48.5 | 4.1 | (1.1) |
Asanko Gold - impairment | (49.5) |  |  |
Depreciation and amortisation | (50.9) | (95.4) |  |
Other expenses | (16.0) | (20.1) |  |
Royalties | (20.9) | (17.2) |  |
Profit for the year before impairment | 107.8 | 9.1 |  |
Group share of profit before impairment | 48.5 | 4.1 |  |
Group's share of total comprehensive income after impairment | (1.0) | 4.1 |  |
Groups share of impairment | $ (49.5) |  |  |
Marverix Metals Incorporated [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Total share of results of equity-accounted investees after taxation |  | 0.4 | 0.9 |
The sale of the shares raised |  | 66.8 |  |
Profit on disposal |  | $ 14.6 | $ 4.0 | $ 48.0
Common shares | 4,125 | 4,125 |  | 10,000
Percentage of ownership on diluted basis |  | 3.68% |  |

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