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Post-retirement benefit obligations - Actuarial Assumptions (Details) | Jun. 30, 2021 | Apr. 01, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Apr. 01, 2020 | Mar. 31, 2020
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South Africa |  |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |  |
Healthcare cost inflation |  |  | 7.50% |  |  | 7.50%
Pension increase assumption |  |  | 5.20% |  |  | 6.10%
Average salary increases |  |  | 5.50% |  |  | 5.50%
South Africa | Pension |  |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |  |
Discount rate |  |  | 11.10% |  |  | 12.20%
Weighted average duration of the obligation |  |  | 12 years |  |  | 12 years
South Africa | Healthcare |  |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |  |
Discount rate |  |  | 11.60% |  |  | 13.30%
Weighted average duration of the obligation |  |  | 13 years |  |  | 14 years
United States |  |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |  |
Average salary increases | 4.20% |  |  | 4.20% |  |
United States | Pension |  |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |  |
Discount rate | 2.00% |  |  | 2.20% |  |
Weighted average duration of the obligation | 7 years |  |  | 14 years |  |
United States | Healthcare |  |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |  |
Discount rate | 2.70% |  |  | 2.30% |  |
Weighted average duration of the obligation | 12 years |  |  | 11 years |  |
Europe |  |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |  |
Pension increase assumption |  | 1.80% |  |  | 1.80% |
Average salary increases |  | 2.80% |  |  | 2.80% |
Europe | Pension |  |  |  |  |  |
Post-retirement benefit obligations |  |  |  |  |  |
Discount rate |  | 1.20% |  |  | 1.40% |
Weighted average duration of the obligation |  | 18 years |  |  | 18 years |

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_147_c&doctype=Standard -URIDate 2020-01-01 + Details
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