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CAPITAL MANAGEMENT (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 23, 2020
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]        
Cash and cash equivalents   $ 367.1 $ 407.8 $ 544.9
Credit facility available for use   387.0 26.6  
Common shares   2,732.1 2,726.3  
Capital Management Liabilities And Equity   3,976.4 3,219.1  
Borrowing costs capitalised   68.3 37.8  
5.75% senior notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt   450.0 450.0  
Borrowing costs capitalised $ 7.5      
5.75% senior notes | Unamortized deferred transactions costs        
Disclosure of detailed information about borrowings [line items]        
Borrowing costs capitalised   4.5 5.5  
Term Loan        
Disclosure of detailed information about borrowings [line items]        
Long-term debt   400.0 0.0  
Term Loan | Unamortized deferred transactions costs        
Disclosure of detailed information about borrowings [line items]        
Borrowing costs capitalised   8.2    
Equipment loans        
Disclosure of detailed information about borrowings [line items]        
Long-term debt   7.3 16.2  
Equipment loans | Unamortized deferred transactions costs        
Disclosure of detailed information about borrowings [line items]        
Borrowing costs capitalised   $ 0.1 $ 0.1