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Exchangeable Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Exchangeable Securities [Abstract]  
Disclosure of borrowing costs Exchangeable Securities
As atDec. 31, 2023Dec. 31, 2022
Carrying valueFace valueInterestCarrying valueFace valueInterest
Exchangeable debentures – due May 1, 2039(1)
344350 7 %3393507 %
Exchangeable preferred shares(2)
4004007 %4004007 %
Total exchangeable securities744750739 750 
(1)Seven per cent unsecured subordinated debentures due May 1, 2039.
(2)Redeemable, retractable first preferred shares (Series I). 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, 2023Dec. 31, 2022
DescriptionBase fair valueSensitivityBase fair valueSensitivity
Option to exchange – embedded derivative— 
+nil
-25
— 
+nil
-25