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Financial Instruments - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 CAD ($) Customer	Dec. 31, 2020 USD ($) Customer	Dec. 31, 2019 CAD ($) Customer
Disclosure of detailed information about financial instruments [Line Items]
Number of customers | Customer	0	0	0
Percentage of change in interest rates	1.00%
Impact on net income due to changes in interest rate	$ 1.0
Fair value of unsecured senior notes	$ 1,023.0		$ 1,428.0
Senior Credit Facility [Member]
Disclosure of detailed information about financial instruments [Line Items]
Credit facility amount withdrawn		$ 75,000,000
Real Estate Credit Facility [Member]
Disclosure of detailed information about financial instruments [Line Items]
Credit facility amount withdrawn		$ 11,000,000
One Customer [Member]
Disclosure of detailed information about financial instruments [Line Items]
Number of customers | Customer	1	1
Percentage of concentration risk rate	12.00%
Credit Risk [Member]
Disclosure of detailed information about financial instruments [Line Items]
Trade receivables	$ 11.0		$ 12.0

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

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- Definition

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Number of customers.

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Percentage concentration risk rate.

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Percentage of change in interest rates.

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