XML 228 R139.htm IDEA: XBRL DOCUMENT v3.22.0.1
FINANCIAL INSTRUMENTS - Narrative (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / bbl
$ / $
$ / shares
$ / oz
Dec. 31, 2021
CAD ($)
$ / bbl
$ / $
Dec. 31, 2020
USD ($)
Dec. 31, 2021
CAD ($)
$ / shares
$ / oz
Sep. 23, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about financial instruments [line items]            
Cash and cash equivalents and short-term investments $ 552,500,000   $ 947,500,000      
Accounts payable and accrued liabilities 304,400,000   244,700,000      
Lease obligations 65,600,000   66,800,000     $ 58,800,000
Borrowings 464,400,000   466,600,000      
Carrying amount of long-term debt $ 450,000,000.0   450,000,000.0      
Percentage of reasonably possible decrease 10.00%     10.00%    
Percentage of reasonably possible 10.00%     10.00%    
Gold floor price, per ounce (in usd per ounce) | $ / oz 1,700     1,700    
Gold cap price, per ounce (in usd per ounce) | $ / oz 2,100     2,100    
Gold option increase price, per ounce (in usd per ounce) | $ / oz 2,100     2,100    
Closing foreign exchange rate (C$ per share) | $ / shares 0.7901     0.7901    
Increase in fair value measurement due to reasonably possible increase in unobservable input, recognised in OCI $ 3,900,000          
Decrease in fair value measurement due to reasonably possible decrease in unobservable input, recognised in OCI 3,900,000          
Realized hedge losses recognized in profit or loss 5,500,000   0      
Hedge ineffectiveness $ 0   0      
Scenario One            
Disclosure of detailed information about financial instruments [line items]            
Estimated exchange rate used for all years (usd$ per C$) | $ / $ 1.30675 1.30675        
Currency exchange, cash delivered $ 7,700,000          
Currency exchange, cash received   $ 10,000,000        
Scenario Two            
Disclosure of detailed information about financial instruments [line items]            
Estimated exchange rate used for all years (usd$ per C$) | $ / bbl 1.30675 1.30675        
Currency exchange, cash delivered $ 15,300,000          
Currency exchange, cash received   $ 20,000,000        
Maximum            
Disclosure of detailed information about financial instruments [line items]            
Estimated exchange rate used for all years (usd$ per C$) | $ / $ 1.30675 1.30675        
Credit Facility Due 2024            
Disclosure of detailed information about financial instruments [line items]            
Borrowing Facilities, Maximum Borrowing Capacity $ 498,300,000          
Equipment loans            
Disclosure of detailed information about financial instruments [line items]            
Borrowings 18,700,000   28,000,000.0      
Carrying amount of long-term debt 18,900,000   28,200,000      
5.75% senior notes            
Disclosure of detailed information about financial instruments [line items]            
Borrowings 445,700,000   438,600,000      
Carrying amount of long-term debt $ 450,000,000.0   450,000,000.0   $ 454,200,000  
Extendable Forward contract            
Disclosure of detailed information about financial instruments [line items]            
Carrying amount of long-term debt       $ 120,000,000    
Estimated exchange rate used for all years (usd$ per C$)   1.32        
Borrowings, monthly amount       10,000,000    
Borrowings, required borrowings       $ 10,000,000    
Cost | 7.0% Senior Notes            
Disclosure of detailed information about financial instruments [line items]            
Carrying amount of long-term debt     438,600,000      
Cost | Equipment loans            
Disclosure of detailed information about financial instruments [line items]            
Carrying amount of long-term debt     $ 28,000,000