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Investment Tax Credit (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Investment Tax Credits [Abstract] |  |
Investment tax credits | $ 9.9 | $ 7.7

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- Definition Investment Tax Credits + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Investment Tax Credits + References No definition available. + Details
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Namespace Prefix: | stn_
Data Type: | xbrli:stringItemType
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