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Share Capital (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity Financing [Line Items]    
Stock Repurchased Authorization 35,145,504  
Repurchased Shares Price Per Share $ 4.89 $ 4.17
Other (loss) gain (note 12) $ (3.7) $ 5.1
Share capital [Member]    
Equity Financing [Line Items]    
Shares repurchased and cancelled (in shares) 1,133,561 2,748,352
Expected cash outflow on redemption or repurchase of puttable financial instruments $ 5.5 $ 10.7
Other (loss) gain (note 12)   5.2
Dividend reinvestment plan and share purchase plan (in shares) 1,186,205  
Dividend reinvestment plan and share purchase plan (ii) $ 10.0  
Shares Repurchased   $ 11.4
Share capital [Member] | Employee Share Purchase Plan [Member]    
Equity Financing [Line Items]    
Dividend reinvestment plan and share purchase plan (ii) $ 8.3