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Exchange rates in US$ (Tables)

12 Months Ended

Dec. 31, 2019

Foreign exchange rates [abstract]

Summary of principal exchange rate used in preparation of financial statements

The principal exchange rates used in the preparation of the 2019 financial statements were:



	Full-year average						Year-end
	2019		2018		2017		2019		2018		2017
Sterling	1.28		1.34		1.29		1.31		1.27		1.34
Australian dollar	0.70		0.75		0.77		0.70		0.70		0.78
Canadian dollar	0.75		0.77		0.77		0.77		0.73		0.79
Euro	1.12		1.18		1.13		1.12		1.14		1.20
South African rand	0.069		0.076		0.075		0.071		0.069		0.081