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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2024
Accounting Policies [Abstract]  
Schedule of Allowance for Credit Loss The rollforward of the allowance for doubtful accounts and credit memo reserves for the three months ended March 31, 2024 is as follows:
Balance as of December 31, 2023
$74,762 
Credit memos charged to revenue24,035 
Allowance for bad debts charged to expense14,338 
Deductions and other(1)
(35,722)
Balance as of March 31, 2024
$77,413 
(1)Primarily consists of the issuance of credit memos, the write-off of accounts receivable and the impact associated with currency translation adjustments.
Schedule of Operating and Financing Lease Right-of-Use Assets and Lease Liabilities
Operating and financing lease right-of-use assets and lease liabilities as of March 31, 2024 and December 31, 2023 are as follows:
DESCRIPTIONMARCH 31, 2024DECEMBER 31, 2023
Assets:
Operating lease right-of-use assets$2,677,803 $2,696,024 
Financing lease right-of-use assets, net of accumulated depreciation(1)
318,753 304,600 
Liabilities:
Current
Operating lease liabilities$301,344 $291,795 
Financing lease liabilities(1)
39,973 39,089 
Long-term
Operating lease liabilities$2,525,552 $2,562,394 
Financing lease liabilities(1)
323,653 310,776 
(1)Financing lease right-of-use assets, current financing lease liabilities and long-term financing lease liabilities are included within Property, plant and equipment, net, Current portion of long-term debt and Long-term debt, net of current portion, respectively, within our Condensed Consolidated Balance Sheets.
Schedule of Lease Costs and Other Information
The components of the lease expense for the three months ended March 31, 2024 and 2023 are as follows:
THREE MONTHS ENDED MARCH 31,
DESCRIPTION20242023
Operating lease cost(1)
$171,746 $155,873 
Financing lease cost:
Depreciation of financing lease right-of-use assets$10,944 $10,008 
Interest expense for financing lease liabilities5,221 4,341 
(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $38,094 and $31,580 for the three months ended March 31, 2024 and 2023, respectively.
Supplemental cash flow information relating to our leases for the three months ended March 31, 2024 and 2023 is as follows:
THREE MONTHS ENDED MARCH 31,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES:20242023
Operating cash flows used in operating leases$117,336 $108,723 
Operating cash flows used in financing leases (interest)5,221 4,341 
Financing cash flows used in financing leases10,679 11,714 
NON-CASH ITEMS:
Operating lease modifications and reassessments$(262)$18,163 
New operating leases (including acquisitions and sale-leaseback transactions)64,556 113,853 
Schedule of Changes in the Carrying Value of Goodwill Attributable to Each Reportable Operating Segment
The changes in the carrying value of goodwill attributable to each reportable segment and Corporate and Other (as defined in Note 9) for the three months ended March 31, 2024 are as follows:
GLOBAL RIM BUSINESSGLOBAL DATA CENTER BUSINESSCORPORATE AND OTHERTOTAL CONSOLIDATED
Goodwill balance, net of accumulated amortization, as of December 31, 2023
$3,911,945 $478,930 $627,037 $5,017,912 
Tax deductible goodwill acquired during the period— — 131,695 131,695 
Fair value and other adjustments143 (186)— (43)
Currency effects(38,502)(2,995)(594)(42,091)
Goodwill balance, net of accumulated amortization, as of March 31, 2024
$3,873,586 $475,749 $758,138 $5,107,473 
Accumulated goodwill impairment balance as of March 31, 2024
$132,409 $— $26,011 $158,420 
Schedule of Assets and Liabilities Carried at Fair Value Measured on a Recurring Basis
The assets and liabilities carried at fair value measured on a recurring basis as of March 31, 2024 and December 31, 2023 are as follows:
  
FAIR VALUE MEASUREMENTS AT MARCH 31, 2024 USING
DESCRIPTION
TOTAL CARRYING
VALUE AT
MARCH 31, 2024
QUOTED PRICES IN
ACTIVE MARKETS
(LEVEL 1)		SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)(2)
Money Market Funds$6,027 $— $6,027 $— 
Time Deposits32,014 — 32,014 — 
Trading Securities10,662 6,783 3,879 — 
Derivative Assets20,290 — 20,290 — 
Deferred Purchase Obligations(1)
113,471 — — 113,471 
  FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2023 USING
DESCRIPTION
TOTAL CARRYING
VALUE AT
DECEMBER 31, 2023
QUOTED PRICES IN
ACTIVE MARKETS
(LEVEL 1)		SIGNIFICANT OTHER
OBSERVABLE INPUTS
(LEVEL 2)
SIGNIFICANT
UNOBSERVABLE
INPUTS (LEVEL 3)(2)
Money Market Funds$68,008 $— $68,008 $— 
Time Deposits15,913 — 15,913 — 
Trading Securities9,952 6,149 3,803 — 
Derivative Assets6,359 — 6,359 — 
Derivative Liabilities5,769 — 5,769 — 
Deferred Purchase Obligations(1)
208,265 — — 208,265 
(1)Primarily relates to the fair values of the deferred purchase obligations associated with the ITRenew Transaction (as defined in Note 3 to Notes to Consolidated Financial Statements included in our Annual Report) and the Regency Transaction (as defined in Note 3).
(2)The following is a rollforward of the Level 3 liabilities presented above for December 31, 2023 through March 31, 2024:
Balance as of December 31, 2023
$208,265 
Additions63,600 
Payments(158,677)
Other changes, including accretion283 
Balance as of March 31, 2024
$113,471 
Schedule of Changes in Accumulated Other Comprehensive Items, Net
The changes in Accumulated other comprehensive items, net for the three months ended March 31, 2024 and 2023 are as follows:
THREE MONTHS ENDED MARCH 31, 2024THREE MONTHS ENDED MARCH 31, 2023
 FOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTALFOREIGN
CURRENCY
TRANSLATION AND OTHER
ADJUSTMENTS		DERIVATIVE FINANCIAL
INSTRUMENTS		TOTAL
Beginning of Period$(373,628)$2,472 $(371,156)$(454,509)$12,506 $(442,003)
Other comprehensive (loss) income:
Foreign currency translation and other adjustments(66,501)— (66,501)39,677 — 39,677 
Change in fair value of derivative instruments— 11,388 11,388 — (3,442)(3,442)
Reclassifications from accumulated other comprehensive items, net— (2,528)(2,528)— — — 
Total other comprehensive (loss) income(66,501)8,860 (57,641)39,677 (3,442)36,235 
End of Period$(440,129)$11,332 $(428,797)$(414,832)$9,064 $(405,768)
Schedule of Cost and Accumulated Amortization Associated with Contract Fulfillment Costs Contract Costs as of March 31, 2024 and December 31, 2023 are as follows:
MARCH 31, 2024DECEMBER 31, 2023
GROSS
CARRYING
AMOUNT		ACCUMULATED
AMORTIZATION		NET
CARRYING
AMOUNT		GROSS
CARRYING
AMOUNT		ACCUMULATED
AMORTIZATION		NET
CARRYING
AMOUNT
Intake Costs asset$76,233 $(38,593)$37,640 $76,150 $(39,617)$36,533 
Commissions asset171,254 (66,803)104,451 156,639 (64,279)92,360 
Schedule of Deferred Revenue Liabilities
Deferred revenue liabilities are reflected in our Condensed Consolidated Balance Sheets as follows:
DESCRIPTIONLOCATION IN BALANCE SHEETMARCH 31, 2024DECEMBER 31, 2023
Deferred revenue - CurrentDeferred revenue$332,801 $325,665 
Deferred revenue - Long-termOther Long-term Liabilities97,075 100,770 
Schedule of Revenue Storage rental revenue associated with our Global Data Center Business for the three months ended March 31, 2024 and 2023 is as follows:
THREE MONTHS ENDED MARCH 31,
20242023
Storage rental revenue$140,028 $107,435 
Schedule of Stock-based Compensation Expense
Stock-based compensation expense for the Employee Stock-Based Awards for the three months ended March 31, 2024 and 2023 is as follows:
THREE MONTHS ENDED MARCH 31,
20242023
Stock-based compensation expense$14,039 $12,509 
Schedule of Acquisition and Integration Costs
Acquisition and Integration Costs for the three months ended March 31, 2024 and 2023 are as follows:
THREE MONTHS ENDED MARCH 31,
20242023
Acquisition and Integration Costs$7,809 $1,595 
Schedule of Loss (Gain) on Disposal/Write-Down of Property, Plant and Equipment, Net
Loss (gain) on disposal/write-down of property, plant and equipment, net for the three months ended March 31, 2024 and 2023 is as follows:
THREE MONTHS ENDED MARCH 31,
2024
2023(1)
Loss (gain) on disposal/write-down of property, plant and equipment, net$389 $(13,061)
(1)    The gains for the three months ended March 31, 2023 primarily consist of a gain of approximately $18,500 associated with a sale-leaseback transaction of a facility in Singapore. The gains recognized during 2023 are the result of our program to monetize a small portion of our industrial assets through sale and sale-leaseback transactions. The terms for these leases are consistent with the terms of our lease portfolio, which are disclosed in detail in Note 2.j. to Notes to Consolidated Financial Statements included in our Annual Report.
Schedule of Other (Income) Expense, Net
Other (income) expense, net for the three months ended March 31, 2024 and 2023 consists of the following:
 THREE MONTHS ENDED MARCH 31,
DESCRIPTION20242023
Foreign currency transaction (gains) losses, net$(16,379)$14,424 
Other, net3,849 6,776 
Other (Income) Expense, Net
$(12,530)$21,200 
Schedule of Income Taxes Our effective tax rates for the three months ended March 31, 2024 and 2023 are as follows:
 THREE MONTHS ENDED MARCH 31,
20242023
Effective Tax Rate(1)
17.7 %20.4 %
(1)The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three months ended March 31, 2024 and 2023 were the benefits derived from the dividends paid deduction and the differences in the tax rates to which our foreign earnings are subject.
Schedule of Basic and Diluted Net Income (Loss) Per Share Attributable to the Entity
The calculations of basic and diluted income (loss) per share for the three months ended March 31, 2024 and 2023 are as follows:
 THREE MONTHS ENDED MARCH 31,
 20242023
Net Income (Loss)$77,025 $65,535 
Less: Net Income (Loss) Attributable to Noncontrolling Interests2,964 940 
Net Income (Loss) Attributable to Iron Mountain Incorporated (utilized in numerator of Earnings Per Share calculation)$74,061 $64,595 
Weighted-average shares—basic292,746,000 291,442,000 
Effect of dilutive potential stock options1,886,000 1,216,000 
Effect of dilutive potential RSUs and PUs589,000 391,000 
Weighted-average shares—diluted295,221,000 293,049,000 
Net Income (Loss) Per Share Attributable to Iron Mountain Incorporated:  
 Basic$0.25 $0.22 
 Diluted$0.25 $0.22 
Antidilutive stock options, RSUs and PUs excluded from the calculation365,764 145,730