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v3.20.4

Income Taxes - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 CAD ($)
Income taxes [Abstract] |
Adjustments of tax expense (income) by change in tax legislation | $ 9.1

X
- Definition Adjustments of tax expense (income) recognised relating to tax legislation changes + References No definition available. + Details
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Namespace Prefix: | stn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Income taxes + References No definition available. + Details
Name: | stn_IncomeTaxesAbstract
Namespace Prefix: | stn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration