Shareholders' capital - Additional Information (Details) - CAD ($) $ / shares in Units, $ in Millions		12 Months Ended
Mar. 05, 2020	Dec. 31, 2019	Dec. 31, 2018
Shareholders' capital
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners	$ 72.0
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share	$ 0.23
Dividends paid, ordinary shares		$ 427.3	$ 388.1
Dividends paid, ordinary shares per share		$ 2.76	$ 2.72

The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of dividends paid per ordinary share.

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The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

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