Debt (Narrative) (Details)	9 Months Ended
Sep. 30, 2021
Line of Credit \| ABL Facility
Debt Instrument
Minimum available borrowing capacity, percentage	10.00%

Debt Instrument, Covenant Terms, Fixed Charge Coverage Ratio Threshold, Minimum Available Borrowing Capacity, Percentage

No definition available.

Name:	uri_DebtInstrumentCovenantTermsFixedChargeCoverageRatioThresholdMinimumAvailableBorrowingCapacityPercentage
Namespace Prefix:	uri_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration