Stockholders' Equity Matters - Noncontrolling Interest (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Sep. 29, 2024
Noncontrolling Interest [Line Items]
Noncontrolling Interests	$ 271,676	$ 198,448
Iron Mountain Data Centers Arizona 3 JV, LP
Noncontrolling Interest [Line Items]
Noncontrolling Interests	$ 74,800
Iron Mountain Data Centers Virginia 4/5 JV, LP
Noncontrolling Interest [Line Items]
Noncontrolling Interests				$ 53,400
Iron Mountain Data Centers Virginia 6/7 JV, LLC
Noncontrolling Interest [Line Items]
Noncontrolling Interests			$ 103,100