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Foreign Exchange (Details) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021 CAD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CAD ($)	Dec. 31, 2020 USD ($)
Effects Of Changes In Foreign Exchange Rates [Line Items]
Adjustments for unrealised foreign exchange losses (gains)	$ 1,905		$ (9,232)
Realized foreign exchange gain	(963)		(544)
Foreign exchange (gain) loss	(2,868)		8,688
Intercompany notes		$ 601.0		$ 751.0
Intercompany notes redeemed and cancelled				$ 150.0
Unrealized foreign exchange loss - intercompany notes
Effects Of Changes In Foreign Exchange Rates [Line Items]
Adjustments for unrealised foreign exchange losses (gains)	12,000		31,617
Unrealized foreign exchange gain - long-term notes & credit facilities
Effects Of Changes In Foreign Exchange Rates [Line Items]
Adjustments for unrealised foreign exchange losses (gains)	$ (13,905)		$ (22,385)

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Foreign Currency Transaction Gain (Loss), Realized1

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Adjustments for unrealised foreign exchange losses (gains) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]]

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