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Interest in Joint Operation - Summary of Share of Joint Operation and Includes Inter-company Transactions and Balances (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
AUD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
 [2]
Non-current assets            
Property, plant and equipment $ 4,892.9   $ 4,524.6 [1]   $ 4,295.6 [1]  
Current assets 1,114.4   1,052.7 [1]      
Cash and cash equivalents 479.0   526.7 [1],[2]   440.0 [2] $ 458.0
Prepayments 51.5   50.1      
Total assets 6,620.1   6,311.5 [1]   5,860.9 [1]  
Total equity            
Retained earnings 1,471.1   1,552.6 [1]   1,433.6 [1]  
Non-current liabilities 2,363.1   2,278.8 [1]      
Deferred taxation 453.9   458.6 [1]   482.2 [1]  
Long-term incentive plan 0.0   23.6 [1]      
Current liabilities 854.0   859.4 [1]      
Trade and other payables 548.5   543.3 [1]      
Stamp duty payable 0.0   13.0 [1]      
Total equity and liabilities 6,620.1   6,311.5 [1]   $ 5,860.9 [1]  
Joint operations [member]            
Non-current assets            
Property, plant and equipment 374.9 $ 485.7 268.6 $ 372.4    
Current assets 7.2 9.3 3.9 5.4    
Cash and cash equivalents 5.3 6.8 0.0 0.0    
Prepayments 1.9 2.5 3.9 5.4    
Total assets 382.1 495.0 272.5 377.8    
Total equity            
Retained earnings (2.3) (2.9) 0.0 0.0    
Non-current liabilities 11.8 15.2 0.1 0.2    
Deferred taxation 4.2 5.4 0.1 0.2    
Long-term incentive plan 7.6 9.8 0.0 0.0    
Current liabilities 372.6 482.7 272.4 377.6    
Related entity loans payable 347.3 449.9 191.7 265.8    
Trade and other payables 14.1 18.3 0.0 0.0    
Deferred consideration 11.2 14.5 67.7 93.8    
Stamp duty payable 0.0 0.0 13.0 18.0    
Total equity and liabilities $ 382.1 $ 495.0 $ 272.5 $ 377.8    
[1] As Restated - Refer note 40 for further details.
[2] The restatement is as a result of the discontinued operations.