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Royalties Paid (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure of Royalty Payment [abstract]  
Summary of royalties paid
United States Dollar
Figures in millions unless otherwise stated202120202019
Amount owing at beginning of the year(17.7)(13.9)(12.5)
Royalties(112.4)(105.0)(73.7)
Amount owing at end of the year20.6 17.7 13.9 
Translation0.7 (1.3)— 
Total royalties paid(108.8)(102.5)(72.3)