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Discontinued Operation - Summary of Results of Discontinued Operation (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items]        
(Loss)/profit for the year from operating activities $ 13.1   $ 1.2 [1] $ (8.2) [1]
Profit/(loss) attributable to owners of the parent from discontinued operations 13.1   1.2 [1] (8.2) [1]
Darlot [Member]        
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items]        
Revenue 49.0   83.1 91.3
Cost of sales (50.7)   (72.1) (85.0)
Cost of sales before gold inventory change and amortisation and depreciation (46.3)   (57.3) (59.8)
Gold inventory change (0.9)   (0.4) 0.6
Amortisation and depreciation (3.5)   (14.4) (25.8)
Other costs, net (1.9)   (7.2) (16.0)
(Loss)/profit before royalties and taxation (3.6)   3.8 (9.7)
Royalties (1.1)   (2.0) (2.1)
(Loss)/profit before taxation (4.7)   1.8 (11.8)
Mining and income taxation 1.4   (0.6) 3.6
(Loss)/profit for the year from operating activities (3.3)   1.2 (8.2)
Gain on sale of discontinued operation 23.5 $ 30.8 0.0 0.0
Income tax on gain on sale of discontinued operation (7.1)   0.0 0.0
Profit/(loss) attributable to owners of the parent from discontinued operations $ 13.1   $ 1.2 $ (8.2)
[1] As Restated - Refer note 40 for further details.