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Taxation Paid - Detailed Information About Income Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income taxes paid (refund) [abstract]      
Amount owing at beginning of the year [1] $ (0.9) $ (46.7) $ (87.0)
SA and foreign current taxation [1] (190.6) (145.7) (204.7)
SA and foreign current taxation recognised in OCI [1] (14.7)    
Amount owing at end of the year [1] 24.8 0.9 46.7
Translation [1] (0.4) 0.8 (4.4)
Total taxation paid [1] $ (181.8) $ (190.7) $ (249.4)
[1] Refer note 42.