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Borrowings - Summary of Borrowings under Credit Facilities (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
AUD ($)
May 27, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]          
Face amount of borrowings $ 1,200.0        
Borrowings 1,078.1 $ 1,526.9      
Repayment (644.2) (1,014.2) $ (1,604.3)    
Variable rate with exposure to repricing (six months or less) 83.5 533.5      
Fixed rate with no exposure to repricing 994.6 993.4      
Committed 1,887.1 1,471.3      
Uncommitted 85.4 104.5      
Undrawn borrowing facilities net 1,972.5 1,575.8      
Undrawn borrowing facilities 1,887.1 1,471.3      
– within one year          
Disclosure of detailed information about borrowings [line items]          
Committed 50.0 166.5      
– later than one year and not later than two years          
Disclosure of detailed information about borrowings [line items]          
Committed 565.6 96.2      
– later than two years and not later than three years          
Disclosure of detailed information about borrowings [line items]          
Committed 766.5 608.6      
– later than three years and not later than five years          
Disclosure of detailed information about borrowings [line items]          
Committed 505.0 600.0      
US Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 1,078.1 1,326.9      
Australian Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 0.0 200.0      
Rand          
Disclosure of detailed information about borrowings [line items]          
Borrowings 0.0 0.0      
the 2020 notes          
Disclosure of detailed information about borrowings [line items]          
Face amount of borrowings 1,000.0        
Borrowings 0.0 0.0     $ 250.0
the 2020 notes | US Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 0.0 0.0 601.4    
Unwinding of transaction costs 0.0 0.9      
Repayment 0.0 (602.3)      
the 5-year notes          
Disclosure of detailed information about borrowings [line items]          
Face amount of borrowings $ 500.0 $ 500.0      
Borrowings maturity, term 5 years 5 years      
Borrowings $ 497.9 $ 497.0      
the 5-year notes | US Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 497.9 497.0 496.3    
Loans advanced 0.0 0.0      
Transaction costs 0.0 0.0      
Unwinding of transaction costs 0.9 0.7      
the 10-year notes          
Disclosure of detailed information about borrowings [line items]          
Face amount of borrowings $ 500.0 $ 500.0      
Borrowings maturity, term 10 years 10 years      
Borrowings $ 496.7 $ 496.4      
the 10-year notes | US Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 496.7 496.4 496.1    
Loans advanced 0.0 0.0      
Transaction costs 0.0 0.0      
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 83.5      
US$150 million revolving senior secured credit facility – old | US Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 0.0 83.5 83.5    
Repayment (83.5) 0.0      
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 0.0      
US$150 million revolving senior secured credit facility - new | US Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 83.5 0.0      
Loans advanced 83.5 0.0      
AU $ 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      
AU $ 500 million syndicated revolving credit facility - old | Australian Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 0.0 0.0 168.5    
Loans advanced 0.0 85.8      
Repayment 0.0 (248.9)      
Translation adjustment 0.0 (5.4)      
AU $ 500 million syndicated revolving credit facility - new          
Disclosure of detailed information about borrowings [line items]          
Face amount of borrowings       $ 500  
Borrowings 0.0 200.0      
AU $ 500 million syndicated revolving credit facility - new | Australian Dollar          
Disclosure of detailed information about borrowings [line items]          
Borrowings 0.0 200.0 0.0    
Loans advanced 0.0 191.0      
Repayment (186.7) 0.0      
Translation adjustment (13.3) 9.0      
US$ 1200 million revolving credit facilities          
Disclosure of detailed information about borrowings [line items]          
Face amount of borrowings 1,200.0        
Borrowings 0.0 250.0 $ 0.0    
Loans advanced 124.0 413.0      
Repayment $ (374.0) $ (163.0)