Stockholders' Equity Matters - Classification of Dividends Paid (Details)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Equity [Abstract]
Nonqualified ordinary dividends	61.10%	82.60%	98.20%
Qualified ordinary dividends	0.00%	0.00%	0.80%
Return of capital	38.90%	17.40%	1.00%
Percent of dividends paid	100.00%	100.00%	100.00%

Percentage Of Total Dividend Paid, Nonqualified Ordinary Dividends

No definition available.

Name:	irm_PercentageOfTotalDividendPaidNonqualifiedOrdinaryDividends
Namespace Prefix:	irm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration