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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Long-term debt    
Long-term debt and credit facilities $ 1,589.9 $ 1,424.2
Operations in Brazil, Mauritania, Ghana and Chile    
Long-term debt    
Fees incured (as a percentage) 0.80%  
Surety bonds outstanding $ 180.8 175.6
EDC    
Long-term debt    
Maximum borrowing capacity $ 300.0  
Borrowings, maturity Jun. 30, 2022  
Fees incured (as a percentage) 0.75%  
Long-term debt and credit facilities $ 232.3 228.9
Surety bond    
Long-term debt    
Fees incured (as a percentage) 0.50%  
Surety bonds outstanding $ 308.2 $ 290.1