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Risk Management Activities - Market Risk - Commodity Price - Gold and Copper - Additional Information (Detail) - Commodity price risk [member] - Fair value hedges [member] R in Millions, $ in Millions, $ in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Jun. 30, 2019 $ / per_oz $ / per_oz ZAR-kg oz | Jan. 31, 2019 $ / per_oz kg oz | Dec. 31, 2018 $ / per_oz oz | Oct. 31, 2018 kg oz | Apr. 30, 2018 $ / per_oz oz | Mar. 31, 2018 $ / per_oz $ / per_oz oz | Feb. 28, 2018 $ / per_oz oz | Nov. 30, 2017 T t | Jun. 30, 2019 $ / per_oz oz | Jan. 31, 2018 $ / per_oz oz | Nov. 30, 2020 T t | Oct. 31, 2020 oz | Jun. 30, 2020 oz | Dec. 31, 2020 USD ($) $ / per_oz oz | Dec. 31, 2020 ZAR (R) $ / per_oz oz | Dec. 31, 2020 AUD ($) $ / per_oz oz | Dec. 31, 2019 USD ($) | Dec. 31, 2019 ZAR (R) | Dec. 31, 2019 AUD ($) | Dec. 31, 2018 oz | Dec. 31, 2020 ZAR (R) | Dec. 31, 2020 AUD ($) | Dec. 31, 2019 ZAR (R) | Dec. 31, 2019 AUD ($)
Peru [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized gain (loss) | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 |  |  | $ 1.2 |  |  |  |  |  |  |
Marked-to-market value of the hedge | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | (14.0) |  |  | 0.0 |  |  |  |  |  |  |
Number of tonnes committed under contract | t |  |  |  |  |  |  |  | 29,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (loss) on hedge ineffectiveness | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.0 |  |  | 1.2 |  |  |  |  |  |  |
Peru [member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tonnes committed under contract | t |  |  |  |  |  |  |  |  |  |  | 24,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of copper | T |  |  |  |  |  |  |  | 6,600 |  |  | 6,525 |  |  |  |  |  |  |  |  |  |  |  |  |
Peru [member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of copper | T |  |  |  |  |  |  |  | 7,431 |  |  | 7,382 |  |  |  |  |  |  |  |  |  |  |  |  |
Ghana [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged |  |  |  |  | 488,900 |  |  |  | 275,000 | 488,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized gain (loss) | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | (114.5) |  |  | 2.3 |  |  |  |  |  |  |
Marked-to-market value of the hedge | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |  | (36.4) |  |  |  |  |  |  |
Ghana [member] | Zero Cost Collar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged | (175,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ghana [member] | Average Rate Forwards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged |  |  |  |  |  |  |  |  | (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized gain (loss) | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36.4 |  |  | (38.9) |  |  |  |  |  |  |
Ghana [member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / per_oz | 1,400 |  |  |  | 1,300 |  |  |  | 1,364 | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ghana [member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / per_oz | 1,557 |  |  |  | 1,418 |  |  |  | 1,449 | 1,418 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ghana [member] | Forward Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / per_oz |  |  |  |  |  |  |  |  | 1,382 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged | 480,000 | 456,000 | 173,000 |  |  | 452,800 | 221,000 |  |  |  |  | 600,000 | 400,000 | 1,000,000 | 1,000,000 | 1,000,000 |  |  |  | 283,000 |  |  |  |
Average Strike Price of Gold Hedged | $ / per_oz |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,190 | 2,190 | 2,190 |  |  |  |  |  |  |  |
Strike price of gold | $ / per_oz |  |  | 1,751 |  |  |  | 1,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized gain (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (201.4) |  | $ (292.2) | (113.4) |  | $ (163.0) |  |  |  |  |
Marked-to-market value of the hedge |  |  |  |  |  |  |  |  |  |  |  |  |  | 27.3 |  |  | 78.3 |  |  |  |  | $ 35.5 |  | $ (111.5)
Unrealized Gain (loss) on hedge ineffectiveness |  |  |  |  |  |  |  |  |  |  |  |  |  | 71.8 |  | $ 104.0 | (65.4) |  | $ (93.4) |  |  |  |  |
Australia [member] | Zero Cost Collar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged | (270,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia [member] | Average Rate Forwards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged | (210,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia [member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Strike Price of Gold Hedged | $ / per_oz | 1,933 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / per_oz |  | 1,800 | 1,720 |  |  | 1,703 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia [member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Strike Price of Gold Hedged | $ / per_oz | 2,014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold |  | 1,869 | 1,789 |  |  | 1,767 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia [member] | Forward Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | $ / per_oz | 1,957 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total realized gain (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | (95.4) | R (1,562.6) |  | (15.2) | R (219.8) |  |  |  |  |  |
Marked-to-market value of the hedge |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |  | 12.6 |  |  |  | R 0.0 |  | R 176.0 |
Unrealized Gain (loss) on hedge ineffectiveness |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.7 | R 176.0 |  | $ 10.6 | R 152.7 |  |  |  |  |  |
South Africa [member] | Cash Settled Average Rate Forwards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa [member] | South deep [member] | Zero Cost Collar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged | (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa [member] | South deep [member] | Average Rate Forwards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged | (100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa [member] | South deep [member] | Cash Settled Average Rate Forwards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume of Gold Hedged |  | 112,613 |  | 112,613 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | kg |  | 617,000 |  | 617,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa [member] | Floor rate [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | ZAR-kg | 660,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa [member] | Interest rate caps [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | ZAR-kg | 727,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa [member] | Forward Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial Risk Management [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price of gold | ZAR-kg | 681,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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