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Risk Management Activities - Summary of Effect of Change in Finance Expense on Group's Profit or Loss had LIBOR and Prime Differed as Indicated (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Decrease of One Point Five Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | $ (3.6) | $ (6.6)
Decrease of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (1.5) | (5.1)
Decrease of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (2.1) | (0.7)
Decrease of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.0 | (0.8)
Decrease of One Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | 4.1 | 3.7
Decrease of One Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (2.4) | (4.3)
Decrease of One Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (1.0) | (3.4)
Decrease of One Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (1.4) | (0.4)
Decrease of One Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.0 | (0.5)
Decrease of Zero Point Five Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (1.2) | (2.2)
Decrease of Zero Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (0.5) | (1.7)
Decrease of Zero Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (0.7) | (0.2)
Decrease of Zero Point Five Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.0 | (0.3)
Increase of Zero Point Percentage Points [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 1.2 | 2.2
Increase of Zero Point Percentage Points [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.5 | 1.7
Increase of Zero Point Percentage Points [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.7 | 0.2
Increase of Zero Point Percentage Points [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.0 | 0.3
Increase of One Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | (3.8) | (3.4)
Increase of One Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 2.4 | 4.3
Increase of One Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 1.0 | 3.4
Increase of One Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 1.4 | 0.4
Increase of One Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.0 | 0.5
Increase of One Point Five Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 3.6 | 6.6
Increase of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 1.5 | 5.1
Increase of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 2.1 | 0.7
Increase of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.0 | 0.8
Decrease of Ten Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | (4.2) | (4.8)
Decrease Of Five Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | (2.1) | (2.4)
Increase Of Five Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | 2.1 | 2.4
Increase of Ten Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | 4.2 | 4.8
Decrease of Two Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | 8.4 | 7.6
Increase of Two Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | (7.4) | (6.7)
One Year Earlier [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | 6.4 | 4.9
One Year Later [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | $ (7.2) | $ (7.5)

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