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Share Capital - Preferred Shares Issued and Outstanding (Details) - shares
shares in Millions
Jun. 30, 2020
Dec. 31, 2020
May 31, 2020
Preferred shares      
Reconciliation of number of shares outstanding [abstract]      
Number of shares   92.2  
Series 8R      
Reconciliation of number of shares outstanding [abstract]      
Number of shares converted (in shares) 0.1    
Number of shares 6.2 6.2 5.2
Series 9QR      
Reconciliation of number of shares outstanding [abstract]      
Number of shares converted (in shares) 1.1    
Number of shares 5.0 5.0 6.0