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Cash Generated by Operations - Summary of Cash Generated by Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from (used in) operating activities [abstract]      
Profit for the year $ 829.5 $ 745.4 $ 174.7
– Mining and income taxation 424.9 432.5 175.6
– Royalties 112.4 105.0 73.7
– Amortisation and depreciation 713.2 661.3 610.0
– Interest expense – environmental rehabilitation 8.6 10.7 11.7
– Non-cash rehabilitation expense/(income) 10.8 1.5 13.4
– Interest received – environmental trust funds (0.8) (0.7) (0.7)
– Impairment, net of reversal of impairment of investments and assets 42.4 (50.6) 9.8
– Write-off of exploration and evaluation assets 21.3 16.9 30.0
– (Profit)/loss on disposal of assets (8.5) 0.2 (1.2)
– Unrealised loss/(gain) and prior year mark-to-market reversals on derivative contracts 53.0 (176.4) 112.6
– Fair value gain on Maverix warrants 4.0 (1.3) (4.2)
– Profit on disposal of Maverix 0.0 0.0 (14.6)
– Silicosis settlement costs (0.7) 0.3 (1.6)
Share-based payments 12.7 14.5 20.5
Long-term incentive plan 28.5 51.3 9.1
– Borrowing costs capitalised (12.5) (13.2) (43.4)
– Share of results of equity-accounted investees, net of taxation 30.4 1.0 (4.5)
Total expected credit loss 41.1 29.0 0.0
– Other non-cash items 1.7 (0.7) 16.6
– Interest expense 103.7 127.7 132.6
– Interest received (7.4) (7.6) (6.6)
– Payment of long-term incentive plan (37.3) 0.0 0.0
Adjustment For Environmental Rehabilitation Payments (23.7) (12.9) (10.7)
Cash generated by operations $ 2,347.3 $ 1,933.9 $ 1,302.8