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Exchangeable Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Exchangeable Securities [Abstract]  
Disclosure of borrowing costs 750 million Exchangeable Securities
As atDec. 31, 2020Dec. 31, 2019
Carrying valueFace valueInterestCarrying valueFace valueInterest
Exchangeable debentures – due May 1, 2039330 350 7 %3263507 %
Exchangeable preferred shares(1)
400 400 7 %— — 7 %
Total long term debt730 750 326 350 

(1) Exchangeable preferred share dividends are reported as interest expense.
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, liabilities
As atDec. 31, 2020Dec. 31, 2019
DescriptionBase fair valueSensitivityBase fair valueSensitivity
Option to exchange – embedded derivative— 
nil
-33
— 
nil
-27