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Long-term debt - Covenant amendment (Details) $ in Millions, R in Billions	Jun. 30, 2021 ZAR (R)	Jun. 30, 2021 USD ($)	Dec. 31, 2020
Long-term debt
Net debt to EBITDA under the debt covenant	3.0	3.0	4.0
Revolving credit facility, repayable November 2024
Long-term debt
Borrowings maximum capacity, target	R 40.6	$ 2,845

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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Borrowings maximum capacity, target

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- Definition

The net debt-to-EBITDA (earnings before interest depreciation and amortization) ratio is a measurement of leverage, calculated as a company's interest-bearing liabilities minus cash or cash equivalents, divided by its EBITDA as described by the debt covenant.

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