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Lease Assets - Amounts Recognized in Administrative and Marketing Expenses (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Leases [Abstract] |  |
Rent expense - variable lease payments | $ 49.7 | $ 48.7
Rent expense - short-term leases and leases of low-value assets | 3.3 | 10.0
Income from subleases | (5.6) | (5.1)
Total | $ 47.4 | $ 53.6

X
- Definition The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_e&doctype=Standard -URIDate 2020-01-01 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition The amount of income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee (‘intermediate lessor’) to a third party, and the lease (‘head lease’) between the head lessor and lessee remains in effect. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Expense relating to short-term leases and leases of low-value assets for which recognition exemption has been used + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Leases + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Total Expense Relating To Lease Payments Not Included In Measurement Of Lease Liabilities. + References No definition available. + Details
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Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration