Consolidated Statement of Changes in Equity (Parenthetical) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders Equity
Income taxes on share issue costs	$ 3.7
Accumulated other comprehensive income (loss) comprises items that will not be recycled	(9.8)	$ 33.7
Accumulated other comprehensive income comprises items that may be recycled	$ 57.2	$ 25.1

Represents amount of accumulated other comprehensive loss will not be recycled.

No definition available.

Name:	or_AccumulatedOtherComprehensiveLossThatWillNotBeRecycled
Namespace Prefix:	or_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration