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Share Capital (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Equity Financing [Line Items]    
Stock Repurchased Authorization 34,485,405  
Shares repurchased and cancelled (in shares) 0 1,100,000
Repurchased Shares Price Per Share   $ 7.41
Shares Repurchased   $ 8.2
Dividends recognised as distributions to owners   35.1
Dividends paid $ (35.3) $ (35.1)
Top of range    
Equity Financing [Line Items]    
Discount rate on prevailing market price from treasury 5.00%  
Restricted share units ("RSU")    
Equity Financing [Line Items]    
Weighted average exercise price of other equity instruments granted in share-based payment arrangement $ 14.07 $ 9.66
Deferred share units ("DSU")    
Equity Financing [Line Items]    
Weighted average exercise price of other equity instruments granted in share-based payment arrangement 14.35 9.67
Performance share units ("PSU")    
Equity Financing [Line Items]    
Weighted average exercise price of other equity instruments granted in share-based payment arrangement $ 14.10 $ 9.65
SHARE CAPITAL    
Equity Financing [Line Items]    
Shares repurchased and cancelled (in shares)   1,100,000
Issuance of shares related to Manitou acquisition (note 8) $ 13.4 $ 0.0
Dividend reinvestment plan and share purchase plan (in shares) 353,084 527,770
DRIP (ii) $ 4.1 $ 4.1
Dividends recognised as distributions to owners   $ 4.1
Shares issued through share purchase plan (in shares) 469,566 373,806
DEFICIT    
Equity Financing [Line Items]    
Dividends recognised as distributions to owners $ 39.4 $ 39.2