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Lease Liabilities - Summary of Finance Lease Liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
Disclosure of finance lease liabilities [line items]          
Balance at the beginning of the year $ 111.5        
Leases recognised on adoption of IFRS 16 (refer note 41)       $ 209.6  
Interest expense (18.6) $ (0.2) $ 0.0    
Balance at the end of the year 447.4 111.5      
Non-current portion of lease liability 287.7 80.1 [1]     $ 0.0
Future minimum lease payments 447.4 111.5      
Interest 114.5 22.9      
Present value of minimum lease payments 332.9 88.6      
Gruyere power purchase agreement [member]          
Disclosure of finance lease liabilities [line items]          
Balance at the beginning of the year 88.6        
Leases recognised on adoption of IFRS 16 (refer note 41) 209.6        
Additions1 67.3 96.2      
Remeasurements of leases during the year2 5.9        
Interest expense 18.6 0.2      
Repayments (56.9) (2.5)      
Translation adjustment (0.2) (5.3)      
Balance at the end of the year 332.9 88.6      
Current portion of lease liability (45.2) (8.5)      
Non-current portion of lease liability 287.7 80.1      
Within one year [member]          
Disclosure of finance lease liabilities [line items]          
Balance at the beginning of the year 11.6        
Balance at the end of the year 63.9 11.6      
Within one year [member] | Gruyere power purchase agreement [member]          
Disclosure of finance lease liabilities [line items]          
Future minimum lease payments 63.9 11.6      
Interest 18.7 3.1      
Present value of minimum lease payments 45.2 8.5      
Later than one years and not later than five years [member] | Gruyere power purchase agreement [member]          
Disclosure of finance lease liabilities [line items]          
Future minimum lease payments 178.2 41.5      
Interest 55.2 11.5      
Present value of minimum lease payments 123.0 30.0      
Later than five years [member]          
Disclosure of finance lease liabilities [line items]          
Balance at the beginning of the year 58.4        
Balance at the end of the year 205.3 58.4      
Later than five years [member] | Gruyere power purchase agreement [member]          
Disclosure of finance lease liabilities [line items]          
Future minimum lease payments 205.3 58.4      
Interest 40.6 8.3      
Present value of minimum lease payments $ 164.7 $ 50.1      
[1] Refer note 42.