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Dividends Declared - Summary of Dividends (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
R / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
R / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
R / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
R / shares
Disclosure of Dividends [line items]              
Total dividends | $   $ 368.6   $ 304.4   $ 322.3  
Dividends per share (in USD cents per share) | $ / shares   $ 0.41   $ 0.34   $ 0.36  
Final dividend              
Disclosure of Dividends [line items]              
2022 final dividend of 445 SA cents per share (2021: 260 SA cents and 2020: 320 SA cents) declared on 23 February 2023. | $   $ 214.7   $ 153.2   $ 190.4  
Dividends per share (in USD cents per share) | R / shares     R 4.45   R 2.60   R 3.20
Interim dividend              
Disclosure of Dividends [line items]              
2023 interim dividend of 325 SA cents was declared during 2023 (2022: 300 SA cents and 2021: 210 SA cents). | $   $ 153.9   $ 151.2   $ 131.9  
Dividends per share (in USD cents per share) | R / shares R 3.25   R 3   R 2.10    
Approved dividend              
Disclosure of Dividends [line items]              
Final dividend approved by the Board (in SA cents per share) | R / shares R 4.20