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Share Capital (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Equity Financing [Line Items]    
Stock Repurchased Authorization 34,670,378  
Repurchased Shares Price Per Share $ 7.41 $ 7.39
Dividends recognised as distributions to owners   $ 34.5
Share capital [Member]    
Equity Financing [Line Items]    
Shares repurchased and cancelled (in shares) 1,100,000 1,583,562
Expected cash outflow on redemption or repurchase of puttable financial instruments $ 8.2  
Repurchase and cancellation of common shares (note 13a) $ (10.4) $ (14.9)
Dividend reinvestment plan and share purchase plan (in shares) 527,770 656,473
Dividend reinvestment plan (iii) $ 4.1 $ 4.6
Shares Repurchased   11.7
Dividends recognised as distributions to owners   4.6
Deficit [member]    
Equity Financing [Line Items]    
Repurchase and cancellation of common shares (note 13a) 2.2 3.2
Dividends recognised as distributions to owners $ 39.2 $ 39.1