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Taxation Paid - Detailed Information About Income Tax (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income taxes paid (refund) [abstract]      
Amount owing at beginning of the year - continuing operations $ (77.5) $ (107.9) $ (59.3)
SA and foreign current taxation - continuing operations (145.7) (204.7) (204.2)
Amount owing at end of the year - continuing operations 5.2 77.5 107.9
Translation 0.8 (4.4) 0.0
Total taxation paid - continuing operations $ (217.2) $ (239.5) $ (155.6)