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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, 2018 | Dec. 31, 2017
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 | $ (15.9) | $ (14.1)
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 | (9.8) | (11.3)
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 | (4.9) | (0.8)
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 | (1.2) | (2.0)
Decrease of One Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | 3.4 |
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 | (10.6) | (9.3)
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 | (6.5) | (7.5)
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 | (3.3) | (0.5)
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 | (0.8) | (1.3)
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 | (5.3) | (4.8)
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 | (3.3) | (3.8)
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 | (1.6) | (0.3)
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 | (0.4) | (0.7)
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 | 5.3 | 4.8
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 | 3.3 | 3.8
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 | 1.6 | 0.3
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 | 0.4 | 0.7
Increase of One Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | (3.4) |
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 | 10.6 | 9.3
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 | 6.5 | 7.5
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 | 3.3 | 0.5
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 | 0.8 | 1.3
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 | 15.9 | 14.1
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 | 9.8 | 11.3
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 | 4.9 | 0.8
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 | 1.2 | 2.0
Decrease of Ten Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | (9.3) | (9.9)
Decrease Of Five Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | (4.7) | (5.0)
Increase Of Five Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | 4.7 | 5.0
Increase of Ten Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | 9.3 | $ 9.9
Decrease of Two Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | 6.8 |
Increase of Two Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | (6.8) |
One Year Earlier [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | 11.1 |
One Year Later [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase/(Decrease) in other comprehensive income | $ (10.1) |

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