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Risk Management Activities - Market Risk - Interest Rate - Narrative (Detail)
$ in Millions, $ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Apr. 15, 2021
USD ($)
Disclosure of Financial Risk Management [line items]        
Borrowings $ 1,236.5 $ 1,079.3    
Revolving credit facility new        
Disclosure of Financial Risk Management [line items]        
Face amount of borrowings 1,200.0      
Borrowings exposed to interest rate fluctuations 23.9   $ 31.6  
US$150 million revolving senior secured credit facility        
Disclosure of Financial Risk Management [line items]        
Borrowings 83.5 83.5    
Face amount of borrowings 150.0      
US$150 million revolving senior secured credit facility | Revolving credit facility        
Disclosure of Financial Risk Management [line items]        
Face amount of borrowings       $ 150.0
Sensitivity to interest rates | Interest bearing borrowings        
Disclosure of Financial Risk Management [line items]        
Borrowings exposed to interest rate fluctuations $ 215.5 $ 83.5