Commitments And Contingencies (Narrative) (Details) R in Millions, $ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 ZAR (R)
Guarantor Obligations [Line Items]
Maximum payment amount under guarantee	$ 6.7	R 93.6
Unsecured Counter Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantee amount	$ 6.7	R 93.6
Payment Guarantee [Member] \| Minimum [Member]
Guarantor Obligations [Line Items]
Commission charge rate	0.40%	0.40%
Payment Guarantee [Member] \| Maximum [Member]
Guarantor Obligations [Line Items]
Commission charge rate	1.94%	1.94%
Nedbank [Member] \| Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantee amount	$ 6.7	R 93.6

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

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- Definition

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

+ References

No definition available.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

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