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Correction of Methodology - Summary of Consolidated Statement of Financial Position (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ASSETS        
Property, plant and equipment $ 4,892.9 $ 4,524.6 [1] $ 4,295.6 [1]  
Others [1]   1,786.9 1,565.3  
Total assets 6,620.1 6,311.5 [1] 5,860.9 [1]  
LIABILITIES        
Deferred taxation 453.9 458.6 [1] 482.2 [1]  
Others [1]   2,679.6 2,622.4  
Total liabilities [1]   3,138.2 3,104.6  
Retained earnings 1,471.1 1,552.6 [1] 1,433.6 [1]  
Other reserves (1,817.8) (2,124.4) [1] (2,260.2) [1]  
Others [1]   3,745.1 3,582.9  
Total equity 3,403.0 3,173.3 [1] 2,756.3 [1] $ 3,655.7 [1]
Total equity and liabilities $ 6,620.1 6,311.5 [1] 5,860.9 [1]  
Previously Stated [member]        
ASSETS        
Property, plant and equipment   4,547.8 4,312.4  
Others   1,786.9 1,565.3  
Total assets   6,334.7 5,877.7  
LIABILITIES        
Deferred taxation   465.5 487.3  
Others   2,679.6 2,622.4  
Total liabilities   3,145.1 3,109.7  
Retained earnings   1,570.9 1,447.3  
Other reserves   (2,126.4) (2,262.2)  
Others   3,745.1 3,582.9  
Total equity   3,189.6 2,768.0 $ 3,663.3
Total equity and liabilities   6,334.7 5,877.7  
Adjustments [Member]        
ASSETS        
Property, plant and equipment   (23.2) (16.8)  
Others   0.0    
Total assets   (23.2) (16.8)  
LIABILITIES        
Deferred taxation   (6.9) (5.1)  
Others   0.0    
Total liabilities   (6.9) (5.1)  
Retained earnings   (18.3) (13.7)  
Other reserves   2.0 2.0  
Others   0.0    
Total equity   (16.3) (11.7)  
Total equity and liabilities   (23.2) (16.8)  
As Restated Before Reclassification of Discontinued Operation [member]        
ASSETS        
Property, plant and equipment   4,524.6 4,295.6  
Others   1,786.9 1,565.3  
Total assets   6,311.5 5,860.9  
LIABILITIES        
Deferred taxation   458.6 482.2  
Others   2,679.6 2,622.4  
Total liabilities   3,138.2 3,104.6  
Retained earnings   1,552.6 1,433.6  
Other reserves   (2,124.4) (2,260.2)  
Others   3,745.1 3,582.9  
Total equity   3,173.3 2,756.3  
Total equity and liabilities   6,311.5 5,860.9  
Discontinued operation reclassification [member]        
ASSETS        
Property, plant and equipment   0.0 0.0  
Others   0.0 0.0  
Total assets   0.0 0.0  
LIABILITIES        
Deferred taxation   0.0 0.0  
Others   0.0 0.0  
Total liabilities   0.0 0.0  
Retained earnings   0.0 0.0  
Other reserves   0.0 0.0  
Others   0.0 0.0  
Total equity   0.0 0.0  
Total equity and liabilities   $ 0.0 $ 0.0  
[1] As Restated - Refer note 40 for further details.