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Warrants (Narrative) (Details)	Dec. 31, 2021 Warrant $ / shares	Dec. 31, 2020 Warrant
Statements Line Items
Warrants outstanding | Warrant	5,480,000	5,480,000
Exercise price of warrant | $ / shares	$ 36.50

X

- Definition

Warrants outstanding

+ References

No definition available.

+ Details

Name:	or_NumberOfWarrantsOutstanding
Namespace Prefix:	or_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Statement [Line Items]

+ References

No definition available.

+ Details

Name:	or_StatementsLineItems
Namespace Prefix:	or_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Warrants outstanding, weighted average exercise price, beginning of period

+ References

No definition available.

+ Details

Name:	or_WarrantsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	or_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant