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v3.19.3.a.u2

Fair Value Of Financial Instruments (Schedule Of Key Valuation Inputs Used To Measure Fair Value Of Investment In Cell C) (Details) - Cell C [Member] $ in Millions, R in Billions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 ZAR (R) | Jun. 30, 2019 ZAR (R)
Net adjusted external debt | $ 1,200.0 | $ 1,000.0 | R 16.4 | R 13.9
Lease liabilities included in net adjusted external debt |  |  | 6.0 | 6.4
Deferred tax including assessed tax losses | $ 206.4 | $ 205.9 | R 2.9 | R 2.9
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member] |  |  |  |
Investment fair value measurement inputs | 15.00% | 15.00% |  |
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member] |  |  |  |
Investment fair value measurement inputs | 20.00% | 20.00% |  |
Long Term Growth Rate [Member] |  |  |  |
Investment fair value measurement inputs | 3.00% | 4.50% |  |
Marketability Discount [Member] |  |  |  |
Investment fair value measurement inputs | 10.00% | 10.00% |  |
Minority Discount [Member] |  |  |  |
Investment fair value measurement inputs | 15.00% | 15.00% |  |

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