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Income Taxes - Summary of Major Components of Current Income Tax Expense from Continuing Operations (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income taxes [Abstract]
Ongoing operations	$ 76.9	$ 54.9
UK reorganization tax and US transition tax	2.6	1.1
Current income tax expense	$ 79.5	$ 56.0

X

- Definition

The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 80
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_80_a&doctype=Standard
-URIDate 2020-01-01

+ Details

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X

- Definition

Income tax expense continuing operations current.

+ References

No definition available.

+ Details

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Namespace Prefix:	stn_
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X

- Definition

Income taxes

+ References

No definition available.

+ Details

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X

- Definition

Tax expense relating to UK reorganization and US transition

+ References

No definition available.

+ Details

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Namespace Prefix:	stn_
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