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v3.20.1

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 | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2020 ZAR (R) | Jun. 30, 2019 ZAR (R)
Net adjusted external debt | $ 1,000.0 | $ 1,000.0 | R 17.6 | [1] | R 13.9 | [2]
Lease liabilities included in net adjusted external debt |  |  | 5.8 | [1] | 6.4 | [2]
Deferred tax including assessed tax losses | $ 162.1 | $ 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 | 22.00% | 22.00% |  |  |  |
Long Term Growth Rate [Member] |  |  |  |  |  |
Investment fair value measurement inputs | 3.50% | 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% |  |  |  |
[1] | translated from ZAR to U.S. dollars at exchange rates applicable as of March 31, 2020.
[2] | translated from ZAR to U.S. dollars at exchange rates applicable as of June 30, 2019.

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