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Acquisition of Windfall Project - Schedule of Fair Value of Contingent Consideration (Details) - Windfall Project
$ in Millions, $ in Millions
 8 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
May 02, 2023
CAD ($)
May 02, 2023
USD ($)
Using the above inputs and valuation technique, the fair value of the contingent consideration amounted to:          
Net change in fair value $ 9.9 $ 7.3      
Translation 0.0 4.4      
Contingent consideration liability 268.3   $ 202.5    
C$300.0 million contingent consideration – initial fair value          
Using the above inputs and valuation technique, the fair value of the contingent consideration amounted to:          
Contingent and exploration considerations 300.0     $ 258.4 $ 190.8
Net change in fair value 9.9 7.3      
C$75.0 million exploration consideration – initial present value          
Using the above inputs and valuation technique, the fair value of the contingent consideration amounted to:          
Contingent and exploration considerations 75.0     $ 52.9 $ 39.1
Net change in fair value 3.9 2.9      
Translation 0.0 $ 0.9      
Contingent consideration liability $ 56.8   $ 42.9