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Borrowings - Summary of Borrowings under Credit Facilities (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
AUD ($)
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings $ 1,200.0      
Borrowings 1,079.3 $ 1,078.1    
Repayments (197.9) (644.2) $ (1,014.2)  
Variable rate with exposure to repricing (six months or less) 83.5 83.5    
Fixed rate with no exposure to repricing 995.8 994.6    
Committed 1,804.3 1,887.1    
Uncommitted 80.0 85.4    
Undrawn borrowing facilities net 1,884.3 1,972.5    
Undrawn borrowing facilities 1,804.3 1,887.1    
– within one year        
Disclosure of detailed information about borrowings [line items]        
Committed 532.8 50.0    
– later than one year and not later than two years        
Disclosure of detailed information about borrowings [line items]        
Committed 766.5 565.6    
– later than two years and not later than three years        
Disclosure of detailed information about borrowings [line items]        
Committed 45.0 766.5    
– later than three years and not later than five years        
Disclosure of detailed information about borrowings [line items]        
Committed 460.0 505.0    
US Dollar        
Disclosure of detailed information about borrowings [line items]        
Borrowings 1,079.3 1,078.1    
Australian Dollar        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0.0 0.0    
Rand        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0.0 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    
Borrowings $ 498.8 $ 497.9    
US$500 million 5-year notes issue | US Dollar        
Disclosure of detailed information about borrowings [line items]        
Borrowings 498.8 497.9 497.0  
Unwinding of transaction costs 0.9 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    
Borrowings $ 497.0 $ 496.7    
US$500 million 10-year notes issue | US Dollar        
Disclosure of detailed information about borrowings [line items]        
Borrowings 497.0 496.7 496.4  
Unwinding of transaction costs 0.3 0.3    
US$150 million revolving senior secured credit facility – old        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 150.0      
Borrowings 0.0 0.0    
US$150 million revolving senior secured credit facility – old | US Dollar        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0.0 0.0 83.5  
Repayments 0.0 (83.5)    
US$150 million revolving senior secured credit facility – new        
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 – new | US Dollar        
Disclosure of detailed information about borrowings [line items]        
Borrowings 83.5 83.5 0.0  
Loans advanced 0.0 83.5    
A$500 million syndicated revolving credit facility        
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 | Australian Dollar        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0.0 0.0 200.0  
Repayments (172.9) (186.7)    
Loans advanced 181.5 0.0    
Translation adjustment (8.6) (13.3)    
US$1,200 million revolving credit facilities        
Disclosure of detailed information about borrowings [line items]        
Face amount of borrowings 1,200.0      
Borrowings 0.0 0.0 $ 250.0  
Repayments (25.0) (374.0)    
Loans advanced $ 25.0 $ 124.0