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Taxation Paid - Detailed Information About Income Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income taxes paid (refund) [abstract]      
Amount owing at beginning of the year $ (24.8) $ (0.9) $ (46.7)
SA and foreign current taxation (366.5) (190.6) (145.7)
SA and foreign current taxation recognised in OCI 0.0 (14.7) 0.0
Amount owing at end of the year 121.3 24.8 0.9
Translation (8.7) (0.4) 0.8
Total taxation paid $ (278.7) $ (181.8) $ (190.7)