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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Feb. 07, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-13045    
Entity Registrant Name IRON MOUNTAIN INC    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 23-2588479    
Entity Address, Address Line One 85 New Hampshire Avenue    
Entity Address, Address Line Two Suite 150    
Entity Address, City or Town Portsmouth    
Entity Address, State or Province NH    
Entity Address, Postal Zip Code 03801    
City Area Code 617    
Local Phone Number 535-4766    
Title of 12(b) Security Common Stock, $.01 par value per share    
Trading Symbol IRM    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 25.7
Entity Common Stock, Shares Outstanding   293,740,905  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Certain information required in Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K (the "Annual Report") is incorporated by reference from our definitive Proxy Statement for our 2025 Annual Meeting of Stockholders (our "Proxy Statement") to be filed with the Securities and Exchange Commission (the "SEC") within 120 days after the close of the fiscal year ended December 31, 2024. 		   
Entity Central Index Key 0001020569    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false