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Borrowings - Summary of Borrowings under Credit Facilities (Detail)
$ in Millions, $ in Millions, $ in Millions
 12 Months Ended
May 09, 2019
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
AUD ($)
Sep. 26, 2023
AUD ($)
May 25, 2023
USD ($)
Apr. 15, 2021
USD ($)
Nov. 19, 2020
AUD ($)
Jul. 25, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 1,236.5   $ 1,079.3              
Repayments of borrowings   (650.9)   (197.9) $ (644.2)            
Variable rate with exposure to repricing (six months or less)   239.4   83.5              
Fixed rate with no exposure to repricing   997.1   995.8              
Committed   1,687.8   1,804.3              
Uncommitted   74.4   80.0              
Undrawn borrowing facilities net   1,762.2   1,884.3              
Undrawn borrowing facilities   1,687.8   1,804.3              
– within one year                      
Disclosure of detailed information about borrowings [line items]                      
Committed   166.5   532.8              
– later than one year and not later than two years                      
Disclosure of detailed information about borrowings [line items]                      
Committed   0.0   766.5              
– later than two years and not later than three years                      
Disclosure of detailed information about borrowings [line items]                      
Committed   0.0   45.0              
– later than three years and not later than five years                      
Disclosure of detailed information about borrowings [line items]                      
Committed   1,521.3   460.0              
US Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   1,212.6   1,079.3              
Australian Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   1,236.5   1,079.3              
Canadian Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   23.9   0.0              
US$500 million 5-year notes issue                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings   $ 500.0   $ 500.0              
Borrowings maturity, term 5 years 5 years 5 years 5 years              
Borrowings   $ 499.6   $ 498.8              
US$500 million 5-year notes issue | US Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   499.6   498.8 497.9            
Unwinding of transaction costs   0.8   0.9              
US$500 million 10-year notes issue                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings   $ 500.0   $ 500.0              
Borrowings maturity, term 10 years 10 years 10 years 10 years              
Borrowings   $ 497.5   $ 497.0              
US$500 million 10-year notes issue | US Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   497.5   497.0 496.7            
Unwinding of transaction costs   0.5   0.3              
US$150 million revolving senior secured credit facility                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings   150.0                  
Borrowings   83.5   83.5              
US$150 million revolving senior secured credit facility | Revolving credit facility                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings                 $ 150.0    
US$150 million revolving senior secured credit facility | US Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   83.5   83.5 83.5            
A$500 million syndicated revolving credit facility – old                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings           $ 500          
Borrowings   0.0   0.0              
A$500 million syndicated revolving credit facility – old | Revolving credit facility                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings                   $ 500  
A$500 million syndicated revolving credit facility – old | Australian Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   0.0   0.0              
Proceeds from borrowings   247.1   181.5              
Repayments of borrowings   (247.0)   (172.9)              
Translation adjustment   (0.1)   (8.6)              
A$500 million syndicated revolving credit facility – new                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings           $ 500          
Borrowings   0.0   0.0              
A$500 million syndicated revolving credit facility – new | Revolving credit facility                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings             $ 500        
A$500 million syndicated revolving credit facility – new | Australian Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   0.0   0.0              
Proceeds from borrowings   160.8     $ 0.0            
Repayments of borrowings   (162.9)   0.0              
Translation adjustment   2.1   0.0              
US$1,200 million revolving credit facilities – old                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings   1,200.0                 $ 1,200.0
Borrowings   0.0   0.0              
US$1,200 million revolving credit facilities – old | US Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   0.0   0.0              
Proceeds from borrowings   241.0   25.0              
Repayments of borrowings   (241.0)   (25.0)              
A$1,200 million revolving credit facility – new                      
Disclosure of detailed information about borrowings [line items]                      
Face amount of borrowings   1,200.0           $ 1,200.0      
Borrowings   155.9   0.0              
Proceeds from borrowings   155.9                  
A$1,200 million revolving credit facility – new | Windfall Project                      
Disclosure of detailed information about borrowings [line items]                      
Proceeds from borrowings   23.9 $ 31.6                
A$1,200 million revolving credit facility – new | Australian Dollar                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   155.9   0.0              
Proceeds from borrowings   $ 155.9   $ 0.0