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Discontinued Operation - Summary of Results of Discontinued Operation (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [line items]        
Revenue $ 2,967.1 $ 2,577.8 $ 2,761.8  
Profit/(loss) before taxation 350.3 (410.7) 152.4  
Loss for the year from operating activities 0.0 0.0 13.1  
Profit attributable to owners of the parent from discontinued operations $ 0.0 $ 0.0 13.1  
Darlot [Member]        
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [line items]        
Revenue     49.0  
Cost of sales     (50.7)  
Cost of sales before gold inventory change and amortisation and depreciation     (46.3)  
Gold inventory change     (0.9)  
Amortisation and depreciation     (3.5)  
Other costs, net     (1.9)  
Loss before royalties and taxation     (3.6)  
Royalties     (1.1)  
Profit/(loss) before taxation     (4.7)  
Mining and income taxation     1.4  
Loss for the year from operating activities     (3.3)  
Gain on sale of discontinued operation     23.5 $ 30.8
Income tax on gain on sale of discontinued operation     (7.1)  
Profit attributable to owners of the parent from discontinued operations     $ 13.1