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Share Capital - PSUs (Narrative) (Details) - PSUs - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Vested and will be settled in cash (in shares) 4,400,000 2,700,000  
Award subject to targets relating to total shareholder return (as a percent) 50.00%    
Award subject to targets relating to net asset value (as a percent)   25.00% 25.00%
Net present value discount rate   10.00% 10.00%
Free cash flows required $ 20    
Award subject to targets relating to execution of corporate strategy (as a percent) 25.00%    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of PSUs that vest (as a percent) 0.00%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of PSUs that vest (as a percent) 200.00%