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Earnings Per Share - Details of Earnings Per Share (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic earnings per share      
Earnings attributable to owners of the parent from continuing operations $ 723.0 $ 161.6 $ (348.2)
Weighted average number of shares issued continuing operations 878,661,474 827,386,603 821,532,707
Diluted earnings per share      
Profit/(loss) from continuing operations $ 719.3 $ 161.6 $ 348.2
Diluted weighted average number of shares issued continuing operations 889,841,717 839,234,102 832,465,491
Net profit/(loss) attributable to owners of the parent has been adjusted by the following to arrive to dilutive profit or loss attributable to parent owner      
South Deep minority interest at 10% 10.00%    
Headline earnings per share      
Headline weighted average number of ordinary shares, continuing operation 878,661,474 827,386,603 821,532,707
Headline earnings $ 729.3 $ 162.7 $ 60.6
Diluted headline earnings per share      
Diluted Headline earnings $ 725.6 $ 162.7 $ 60.6
Diluted headline weighted average number of ordinary shares, continuing operation 889,841,717 839,234,102 832,465,491
Headline Earnings Has Been Adjusted By The Following To Arrive Dilutive Headline Earnings [Abstract]      
South Deep minority interest at 10% 10.00%