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Exchange rates in US$ (Tables)
 12 Months Ended
Dec. 31, 2018
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 2018 financial statements were:

 

 

 

 

Full-year average

 

Year-end

 

 

 

 

2018

 

 

2017

 

 

2016

 

 

2018

 

 

2017

 

 

2016

 

Sterling

 

 

1.34

 

 

1.29

 

 

1.36

 

 

1.27

 

 

1.34

 

 

1.22

 

Australian dollar

 

 

0.75

 

 

0.77

 

 

0.74

 

 

0.70

 

 

0.78

 

 

0.72

 

Canadian dollar

 

 

0.77

 

 

0.77

 

 

0.76

 

 

0.73

 

 

0.79

 

 

0.74

 

Euro

 

 

1.18

 

 

1.13

 

 

1.11

 

 

1.14

 

 

1.20

 

 

1.05

 

South African rand

 

 

0.076

 

 

0.075

 

 

0.068

 

 

0.069

 

 

0.081

 

 

0.073