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Risk Management Activities - Market Risk - Interest Rate - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Financial Risk Management [line items] |  |
Borrowings | $ 2,011.6 | $ 1,781.5
Change in London Interbank Offered Rate [member] | Interest Bearing Borrowings [Member] | Floating Interest Rate [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
Borrowings exposed to interest rate fluctuations | 711.5 | 508.5
Johannesburg Interbank Average Rate and Prime Interest Rates [member] | Interest Bearing Borrowings [Member] | Floating Interest Rate [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
Borrowings exposed to interest rate fluctuations | 47.9 | 79.5
Change in South African Prime Interest Rate [Member] | Interest Bearing Borrowings [Member] | Floating Interest Rate [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
Borrowings exposed to interest rate fluctuations | 86.3 | 114.1
Change in Bank Bill Swap Bid Rate [member] | Interest Bearing Borrowings [Member] | Floating Interest Rate [member] |  |
Disclosure Of Financial Risk Management [line items] |  |
Borrowings exposed to interest rate fluctuations | 316.5 | 231.5
Sensitivity to interest rates [member] | Interest Bearing Borrowings [Member] |  |
Disclosure Of Financial Risk Management [line items] |  |
Borrowings exposed to interest rate fluctuations | $ 1,162.2 | $ 933.6

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