Other non-current assets (Narrative) (Details) - Financing Receivable [Member]	12 Months Ended
Dec. 31, 2021
Minimum [Member]
Term of financing lending arrangement	1 year
Maximum [Member]
Term of financing lending arrangement	2 years

Period between issuance and maturity of financing receivable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	rba_FinancingReceivableTerm
Namespace Prefix:	rba_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration