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Cash Generated by Operations - Summary of Cash Generated by Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from (used in) operating activities [abstract]      
Profit/(loss) for the year $ 745.4 $ 174.7 $ (344.8)
Mining and income taxation 432.5 175.6 (65.9)
Royalties 105.0 73.7 62.5
Interest expense 127.7 132.6 91.8
Interest received (7.6) (6.6) (6.8)
Amortisation and depreciation 661.3 610.0 668.4
Interest expense - environmental rehabilitation 10.7 11.7 11.7
Non-cash rehabilitation expense/(income) 1.5 13.4 (0.9)
Interest received - environmental trust funds (0.7) (0.7) (0.6)
Impairment, net of reversal of impairment of investments and assets (50.6) 9.8 520.3
Write-off of exploration and evaluation assets 16.9 30.0 37.7
(Profit)/loss on disposal of assets 0.2 (1.2) 51.6
Gain on acquisition of Asanko 0.0 0.0 (51.8)
Unrealised (gain)/loss and prior year mark-to-market reversals on derivative contracts (176.4) 112.6 36.6
Fair value gain on Maverix warrants (1.3) (4.2) (3.8)
Profit on disposal of Maverix 0.0 (14.6) (4.0)
Silicosis settlement costs 0.3 (1.6) (4.5)
Share-based payments 14.5 20.5 37.5
Long-term incentive plan expense 51.3 9.1 1.1
Payment of long-term incentive plan 0.0 0.0 (17.8)
Borrowing costs capitalised (13.2) (43.4) (17.5)
Share of results of equity-accounted investees, net of taxation 1.0 (4.5) 0.2
Tarkwa expected credit loss 29.0 0.0 0.0
Other (13.6) 5.9 (3.0)
Total cash generated by operations $ 1,933.9 $ 1,302.8 $ 998.0