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Cash Generated by Operations - Summary of Cash Generated by Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from (used in) operating activities [abstract]      
(Loss)/profit from continuing operations $ (20.8) $ 167.9 [1] $ (239.6) [1]
Mining and income taxation 173.2 189.5 [1] 248.5 [1]
Royalties 62.0 78.4 [1] 73.9 [1]
Interest expense 91.2 82.5 87.8
Interest received (5.1) (7.3) [2] (5.9) [2]
Amortisation and depreciation 748.1 671.4 591.5
Interest expense - environmental rehabilitation 12.1 10.7 11.7
Non-cash rehabilitation income (13.5) (9.7) (14.6)
Interest received - environmental trust funds (0.5) (1.0) [1] (0.4) [1]
Impairment, net of reversal of impairment of investments and assets 200.2 76.5 206.9
Write-off of exploration and evaluation assets 51.5 41.4 [1] 29.1 [1]
(Profit)/loss on disposal of assets (4.0) (48.0) [1] 0.1 [1]
Profit on disposal of investments 0.0 (2.3) [1] (0.1) [1]
Share-based payments 26.8 14.0 [1] 10.7 [1]
Long-term incentive plan expense 5.0 10.5 [1] 5.1 [1]
Payment of long-term incentive plan (11.5) 0.0 0.0
Borrowing costs capitalised (22.9) (15.1) (16.6)
Share of results of equity-accounted investees, net of taxation (0.3) 0.0 2.4
Other (5.0) (14.0) (7.9)
Total cash generated by operations $ 1,286.5 $ 1,245.4 [2] $ 982.6 [2]
[1] As Restated - Refer note 40 for further details.
[2] The restatement is as a result of the discontinued operations.