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Financial Instruments and Risk Management (Currency Contracts) (Details)
oz in Thousands, $ in Millions, $ in Millions, $ in Millions
 2 Months Ended 12 Months Ended
Feb. 23, 2023
$ / oz
oz
Dec. 31, 2022
USD ($)
$ / oz
Dec. 31, 2021
USD ($)
$ / oz
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
$ / $
Dec. 31, 2022
MXN ($)
Dec. 31, 2022
$ / $
Contract Options              
Disclosure of detailed information about hedged items [line items]              
Ounce of gold | oz 12            
Collars and Forwards              
Disclosure of detailed information about hedged items [line items]              
Financial liabilities, at fair value | $     $ 2.6        
Gains (losses) on change in fair value of derivatives | $   $ (1.1) (3.8)        
Gold Options | Commodity price risk              
Disclosure of detailed information about hedged items [line items]              
Financial assets, at fair value | $     0.5        
Gains (losses) on change in fair value of derivatives | $   $ (3.5) $ (0.5)        
Gold Options | Commodity price risk | Contract Options | Maximum              
Disclosure of detailed information about hedged items [line items]              
Average realized price per ounce | $ / oz 2,163            
Gold Options | Commodity price risk | Contract Options | Minimum              
Disclosure of detailed information about hedged items [line items]              
Average realized price per ounce | $ / oz 1,800            
2018 | Gold Options | Commodity price risk | Purchase Put Options              
Disclosure of detailed information about hedged items [line items]              
Average realized price per ounce | $ / oz   1,755          
2019 | Collars | Currency risk              
Disclosure of detailed information about hedged items [line items]              
Notional amount       $ 558.0   $ 1,020.0  
2019 | Bought Puts | Currency risk              
Disclosure of detailed information about hedged items [line items]              
Notional amount | $       $ 30.0      
Bottom of range | Gold Options | Market risk              
Disclosure of detailed information about hedged items [line items]              
Average realized price per ounce | $ / oz     1,629        
Bottom of range | 2019 | Collars | Currency risk              
Disclosure of detailed information about hedged items [line items]              
Average rate of hedging instrument         129.00%   2046.00%
Bottom of range | 2019 | Bought Puts | Currency risk              
Disclosure of detailed information about hedged items [line items]              
Average rate of hedging instrument | $ / $         131.00%    
Top of range | Gold Options | Market risk              
Disclosure of detailed information about hedged items [line items]              
Average realized price per ounce | $ / oz     2,039        
Top of range | 2019 | Collars | Currency risk              
Disclosure of detailed information about hedged items [line items]              
Average rate of hedging instrument         135.00%   2259.00%
Top of range | 2019 | Bought Puts | Currency risk              
Disclosure of detailed information about hedged items [line items]              
Average rate of hedging instrument | $ / $         0.00%