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Taxation Paid - Detailed Information About Income Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income taxes paid (refund) [abstract]      
Amount owing at beginning of the year - continuing operations $ (107.9) [1] $ (59.3) $ (37.8)
SA and foreign current taxation - continuing operations (204.7) (204.2) (141.7)
Amount owing at end of the year - continuing operations 77.5 107.9 [1] 59.3
Translation (4.4) 0.0 3.0
Total taxation paid - continuing operations $ (239.5) $ (155.6) [2] $ (117.2) [2]
[1] As Restated - Refer note 40 for further details.
[2] The restatement is as a result of the discontinued operations.