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Investment Tax Credit (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Investment tax credits [Abstract] |  |
Investment tax credits | $ 10.5 | $ 11.5

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- Definition Investment tax credits + References No definition available. + Details
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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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Period Type: | duration