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Stated Capital - Schedule of Stated Capital (Detail) $ in Millions, R in Billions |  | 12 Months Ended
--- | --- | ---
Feb. 12, 2020 USD ($) shares | Feb. 12, 2020 ZAR (R) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning Balance | $ |  |  | $ 3,622.5 |  |
Share issue | $ 249.0 | R 3.7 | 249.0 | $ 0.0 | $ 0.0
Ending balance | $ |  |  | 3,871.5 | 3,622.5 |
Placing of ordinary shares | 41,431,635 | 41,431,635 |  |  |
Ordinary Shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning Balance | $ |  |  | 3,622.5 | 3,622.5 |
Share issue | $ |  |  | 249.0 | 0.0 |
Ending balance | $ |  |  | $ 3,871.5 | $ 3,622.5 | $ 3,622.5
In issue at 1 January |  |  | 828,632,707 | 821,532,707 |
Placing of ordinary shares |  |  | 41,431,635 | 0 |
Exercise of employee share options |  |  | 13,269,176 | 7,100,000 |
In issue at 31 December |  |  | 883,333,518 | 828,632,707 | 821,532,707
Authorised |  |  | 2,000,000,000 | 2,000,000,000 |

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