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Investments in and loans to equity accounted investees, and other long-term assets - Additional Information (Details)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2023
CAD ($)
Jul. 31, 2022
CAD ($)
Jun. 30, 2022
Mar. 31, 2023
USD ($)
jointVenture
Mar. 31, 2023
CAD ($)
jointVenture
Mar. 31, 2021
USD ($)
Mar. 31, 2021
CAD ($)
Dec. 31, 2022
USD ($)
Schedule Of Equity Method Investments [Line Items]                
Number of joint ventures | jointVenture       2 2      
Dayhu JV                
Schedule Of Equity Method Investments [Line Items]                
Equity method investments, ownership percent       50.00%        
Equity investment balance, contributions made in joint venture       $ 41.3        
Dayhu JV | Daylu JV Loan                
Schedule Of Equity Method Investments [Line Items]                
Debt instrument, term           30 months 30 months  
Equity method investment, outstanding related party loan       0.0       $ 38.1
Dayhu JV | New Daylu Loan                
Schedule Of Equity Method Investments [Line Items]                
Equity method investment, commitment amount $ 46.0              
Percentage of construction loan 50.00%              
Dayhu JV | Maximum | Daylu JV Loan                
Schedule Of Equity Method Investments [Line Items]                
Equity method investment, commitment amount           $ 61.2 $ 82.7  
Dayhu JV | Maximum | New Daylu Loan                
Schedule Of Equity Method Investments [Line Items]                
Equity method investment, commitment amount       $ 34.0        
Dayhu JV | Minimum | New Daylu Loan                
Schedule Of Equity Method Investments [Line Items]                
Equity method investment, commitment amount   $ 46.0            
Beedie JV                
Schedule Of Equity Method Investments [Line Items]                
Equity method investments, ownership percent       50.00%        
Equity investment balance, contributions made in joint venture           $ 16.3    
Debt instrument, term     30 months          
Beedie JV | Maximum                
Schedule Of Equity Method Investments [Line Items]                
Equity method investment, commitment amount       $ 5.5 $ 7.5      
Debt instrument, term     5 years          
Percentage of construction loan     80.00%