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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 29, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of equity-accounted investees [line items] |  |  |  |
Non-current assets |  | $ 5,183.2 | $ 5,505.7 |
Current assets |  | 921.1 | 1,114.4 |
Non-current liabilities |  | (2,781.9) | (2,363.1) |
Current liabilities |  | (615.5) | (854.0) |
Less: Shika redeemable preference shares |  | (132.9) |  |
Cash consideration paid |  | 216.8 |  |
Consideration paid for equity portion |  | 165.0 |  |
Gain on acquisition |  | 51.8 | 0.0 | $ 0.0
Carrying amount of interest in joint venture |  | 177.5 | 128.6 | 0.0
Revenue |  | 2,577.8 | 2,761.8 | 2,666.4
Total equity-accounted investees |  | 225.1 | 171.3 | 0.0
Total share of results of equity-accounted investees after taxation |  | (13.1) | (1.3) | (2.3)
Depreciation and amortisation |  | (668.4) | (748.1) | (671.4)
Other expenses |  | (44.8) | (19.0) | (16.8)
Royalties |  | (62.5) | (62.0) | (78.4)
Income tax expense |  | 65.9 | (173.2) | (189.5)
(Loss)/profit for the year |  | (344.8) | (7.7) | 169.1
Other comprehensive income |  | (330.0) | 279.2 | 121.4
Total comprehensive income |  | (674.8) | 271.5 | 290.5
Asanko Gold Ghana Limited [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Interest on joint venture | 45.00% |  |  |
Shika Group Finance Limited [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Interest on joint venture | 50.00% |  |  |
Adansi Gold Company Ghana Limited [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Interest on joint venture | 50.00% |  |  |
Far Southeast Gold Resources Incorporated [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Initial investment at cost |  | 91.7 | 128.6 |
Share of loss after taxation |  | 12.9 | 1.6 |
Carrying amount of interest in joint venture |  | $ 91.7 | $ 128.6 | $ 0.0
Interest on joint venture |  | 40.00% | 40.00% | 40.00%
Total share of results of equity-accounted investees after taxation |  | $ (12.9) | $ (1.6) | $ (2.3)
Asanko Gold [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Non-current assets |  | 481.2 |  |
Initial investment at cost |  | 86.9 |  |
Current assets |  | 109.3 |  |
Non-current liabilities |  | (34.2) |  |
Current liabilities |  | (52.7) |  |
Net assets |  | 503.6 |  |
Less: Provisional purchase price allocation - fair value adjustment |  | (39.6) |  |
Less: Shika redeemable preference shares |  | (291.4) |  |
Net assets attributable to ordinary shareholders |  | 172.6 |  |
Group's share of net assets |  | 85.8 |  |
Cash consideration paid |  | 165.0 |  |
Less: consideration allocated to the redeemable preference shares (note 17) |  | (129.9) |  |
Consideration paid for equity portion |  | 35.1 |  |
Gain on acquisition |  | 51.8 |  |
Share of loss after taxation |  | (1.1) |  |
Carrying amount of interest in joint venture |  | 85.8 | 0.0 | 0.0
Revenue |  | 122.0 |  |
Production costs |  | (79.0) |  |
Depreciation and amortisation |  | (34.3) |  |
Other expenses |  | (4.9) |  |
Royalties |  | (6.2) |  |
Income tax expense |  | 0.0 |  |
(Loss)/profit for the year |  | (2.4) |  |
Other comprehensive income |  | 0.0 |  |
Total comprehensive income |  | (2.4) |  |
Group's share of total comprehensive income |  | (1.1) |  |
Asanko Gold [member] | Asanko Gold Ghana Limited [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Carrying amount of interest in joint venture |  | $ 5.4 |  |
Interest on joint venture |  | 45.00% |  |
Asanko Gold [member] | Shika Group Finance Limited [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Carrying amount of interest in joint venture |  | $ 80.4 |  |
Interest on joint venture |  | 50.00% |  |
Asanko Gold [member] | Adansi Gold Company Ghana Limited [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Carrying amount of interest in joint venture |  | $ 0.0 |  |
Interest on joint venture |  | 50.00% |  |
Investment in associates [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Total equity-accounted investees |  | $ 47.6 | 42.7 | 0.0
Marverix Metals Incorporated [Member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Total equity-accounted investees |  | 47.6 | 42.7 | 0.0
Total share of results of equity-accounted investees after taxation |  | 0.9 | 0.3 | 0.0
Other [Member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Total equity-accounted investees |  | 0.0 | 0.0 | 0.0
Total share of results of equity-accounted investees after taxation |  | 0.0 | 0.0 | 0.0
Asanko Gold Ghana Limited [member] |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |
Total share of results of equity-accounted investees after taxation |  | $ (1.1) | $ 0.0 | $ 0.0

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