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Capital Management - Summary of Reconciliation of Net Operating Profit (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Times
Dec. 31, 2016
USD ($)
Times
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
 [2]
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Borrowings $ 1,781.5 $ 1,692.9    
Less: Cash and cash equivalents 479.0 526.7 [1],[2] $ 440.0 [2] $ 458.0
Net debt 1,302.5 1,166.2    
Adjusted EBITDA $ 1,263.7 $ 1,232.2    
Net debt to adjusted EBITDA | Times 1.03 0.95    
Reconciliation of (loss)/profit for the year to adjusted EBITDA:        
(Loss)/profit for the year $ (7.7) $ 169.1 [1] (247.8) [1]  
Mining and income taxation from continuing operations 173.2 189.5 [1] 248.5 [1]  
Mining and income taxation from discontinued operations (1.4) 0.6    
Royalties 62.0 78.4 [1] 73.9 [1]  
Finance expense from continuing operations 81.3 78.1 [1] 82.9 [1]  
Investment income from continuing operations (5.6) (8.3) [1] (6.3) [1]  
Gain on financial instruments from continuing operations (34.4) (14.4) [1] 4.5 [1]  
Foreign exchange loss from continuing operations 3.5 6.4 [1] (9.5) [1]  
Amortisation and depreciation 748.1 671.4 [1] 591.5 [1]  
Share-based payments from continuing operations 26.8 14.0 [1] 10.7 [1]  
Long-term incentive plan from continuing operations 5.0 10.5 [1] 5.1 [1]  
Restructuring costs from continuing operations 9.2 11.7 [1] 9.3 [1]  
Silicosis settlement costs from continuing operations 30.2 0.0 [1] 0.0 [1]  
Impairment, net of reversal of impairment of investments and assets from continuing operations 200.2 76.5 [1] 206.9 [1]  
Profit on disposal of investments from continuing operations 0.0 (2.3) [1] (0.1) [1]  
Profit on disposal of assets from continuing operations (4.0) (48.0) [1] 0.1 [1]  
Gain on sale of discontinued operation, net of taxation (16.4) 0.0    
Share of results of equity-accounted investees, net of taxation 1.3 2.3 [1] 5.7 [1]  
Rehabilitation income from continuing operations (13.5) (9.7) (14.6)  
Profit on buy-back of notes 0.0 (17.7) 0.0  
Other 1.3 7.7    
Adjusted EBITDA 1,263.7 1,232.2    
Continuing operations [member]        
Reconciliation of (loss)/profit for the year to adjusted EBITDA:        
(Loss)/profit for the year (20.8) 167.9 (239.6)  
Mining and income taxation from continuing operations 173.2 189.5 248.5  
Royalties 62.0 78.4 73.9  
Finance expense from continuing operations 81.3 (78.1) 82.9  
Investment income from continuing operations (5.6) (8.3) (6.3)  
Amortisation and depreciation 748.1 671.4 591.5  
Share-based payments from continuing operations 26.8 14.0 10.7  
Long-term incentive plan from continuing operations 5.0 10.5 5.1  
Restructuring costs from continuing operations 9.2 11.7 9.3  
Silicosis settlement costs from continuing operations (30.2)      
Profit on disposal of investments from continuing operations 0.0      
Profit on disposal of assets from continuing operations (4.0) (48.0) 0.1  
Discontinued operations [member]        
Reconciliation of (loss)/profit for the year to adjusted EBITDA:        
(Loss)/profit for the year 13.1 1.2 (8.2)  
Mining and income taxation from continuing operations 5.7 0.6 (3.6)  
Royalties 1.1 2.0 2.1  
Finance expense from continuing operations 0.0 (0.2) 0.0  
Investment income from continuing operations (0.4) 0.0 0.0  
Amortisation and depreciation 3.5 14.4 25.8  
Share-based payments from continuing operations 0.6 0.4 0.2  
Long-term incentive plan from continuing operations 0.1 0.5 0.2  
Restructuring costs from continuing operations 0.0 0.0 0.0  
Silicosis settlement costs from continuing operations 0.0      
Profit on disposal of investments from continuing operations (23.5)      
Profit on disposal of assets from continuing operations $ 0.0 $ 0.0 $ 0.0  
[1] As Restated - Refer note 40 for further details.
[2] The restatement is as a result of the discontinued operations.