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Significant Judgments in Applying Accounting Policies Disclosure of significant accounting policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]    
Impairment charges $ 78.6 $ 99.1
Deferred Stripping Costs | Dolores    
Disclosure of detailed information about property, plant and equipment [line items]    
Deferred stripping costs 6.1 20.0
Deferred Stripping Costs | La Arena    
Disclosure of detailed information about property, plant and equipment [line items]    
Deferred stripping costs $ 29.9 $ 42.2