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Cash Generated by Operations - Summary of Cash Generated by Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from (used in) operating activities [abstract]      
Profit/(loss) from continuing operations $ 174.7 $ (344.8) [1] $ (20.8) [1]
Mining and income taxation 175.6 (65.9) [1] 173.2 [1]
Royalties [1] 73.7 62.5 62.0
Interest expense 132.6 91.8 [1] 91.2 [1]
Interest received (6.6) (6.8) [1] (5.1) [1]
Amortisation and depreciation 610.0 668.4 [1] 748.1 [1]
Interest expense - environmental rehabilitation 11.7 11.7 [1] 12.1 [1]
Non-cash rehabilitation expense/(income) 13.4 (0.9) [1] (13.5) [1]
Interest received - environmental trust funds (0.7) (0.6) [1] (0.5) [1]
Impairment, net of reversal of impairment of investments and assets 9.8 520.3 [1] 200.2 [1]
Write-off of exploration and evaluation assets 30.0 37.7 [1] 51.5 [1]
(Profit)/loss on disposal of assets (1.2) 51.6 [1] (4.0) [1]
Gain on acquisition of Asanko 0.0 (51.8) [1] 0.0 [1]
Unrealised loss/(gain) on derivative contracts 112.6 36.6 [1] (20.7) [1]
Fair value (gain)/loss on Maverix warrants (4.2) (3.8) [1] 0.4 [1]
Profit on disposal of Maverix (14.6) (4.0) [1] 0.0 [1]
Silicosis settlement costs (1.6) (4.5) [1] 30.2 [1]
Share-based payments 20.5 37.5 [1] 26.8 [1]
Long-term incentive plan expense 9.1 1.1 [1] 5.0 [1]
Payment of long-term incentive plan 0.0 (17.8) [1] (11.5) [1]
Borrowing costs capitalised (43.4) (17.5) [1] (22.9) [1]
Share of results of equity-accounted investees, net of taxation (4.5) 0.2 [1] (0.3) [1]
Other 5.9 (3.0) [1] (14.9) [1]
Total cash generated by operations $ 1,302.8 $ 998.0 [1] $ 1,286.5 [1]
[1] Refer note 42.