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Debt (Tables)
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Schedule of Carrying Amount and Fair Value of Long-Term Debt Instruments
Long-term debt is as follows:
 SEPTEMBER 30, 2025DECEMBER 31, 2024
 
DEBT
(INCLUSIVE OF
DISCOUNT)
UNAMORTIZED
DEFERRED
FINANCING
COSTS
CARRYING
AMOUNT
FAIR
VALUE
DEBT
(INCLUSIVE OF
DISCOUNT)
UNAMORTIZED
DEFERRED
FINANCING
COSTS
CARRYING
AMOUNT
FAIR
VALUE
Revolving Credit Facility(1)
$233,000 $(8,691)$224,309 $233,000 $121,000 $(9,253)$111,747 $121,000 
Term Loan A(1)
493,750 — 493,750 493,750 216,016 — 216,016 216,016 
Term Loan B(1)
1,827,457 (12,864)1,814,593 1,836,678 1,840,181 (14,690)1,825,491 1,850,698 
Virginia 3 Term Loans(2)
271,079 (1,634)269,445 271,079 271,079 (3,013)268,066 271,079 
Virginia 4/5 Term Loans(2)
204,987 (277)204,710 204,987 76,535 (2,752)73,783 76,535 
Virginia 6 Term Loans(2)
210,000 (3,126)206,874 210,000 137,495 (4,605)132,890 137,495 
Virginia 7 Term Loans(2)
239,595 (5,167)234,428 239,595 32,074 (7,591)24,483 32,074 
Australian Dollar Term Loan(2)
260,778 (1,989)258,789 262,606 175,813 (265)175,548 176,655 
UK Revolving Credit Facility188,186 (2,458)185,728 188,186 175,503 (1,034)174,469 175,503 
GBP Notes(2)
537,674 (85)537,589 534,986 501,437 (789)500,648 490,155 
47/8% Notes due 2027(2)(3)
1,000,000 (2,844)997,156 995,000 1,000,000 (3,910)996,090 972,500 
51/4% Notes due 2028(2)(3)
825,000 (2,952)822,048 821,906 825,000 (3,838)821,162 804,375 
5% Notes due 2028(2)(3)
500,000 (2,050)497,950 496,250 500,000 (2,592)497,408 481,250 
7% Notes due 2029(2)(3)
1,000,000 (7,091)992,909 1,028,750 1,000,000 (8,686)991,314 1,020,000 
47/8% Notes due 2029(2)(3)
1,000,000 (5,786)994,214 983,750 1,000,000 (6,871)993,129 945,000 
51/4% Notes due 2030(2)(3)
1,300,000 (7,270)1,292,730 1,283,750 1,300,000 (8,399)1,291,601 1,235,000 
41/2% Notes(2)(3)
1,100,000 (6,741)1,093,259 1,050,500 1,100,000 (7,674)1,092,326 1,001,000 
5% Notes due 2032(2)
750,000 (8,921)741,079 720,938 750,000 (9,900)740,100 688,125 
55/8% Notes(2)(3)
600,000 (3,969)596,031 596,250 600,000 (4,404)595,596 570,000 
61/4% Notes(2)(3)
1,200,000 (13,202)1,186,798 1,222,500 1,200,000 (14,517)1,185,483 1,194,000 
43/4% Euro Senior Notes due 2034 (the "Euro Notes")(3)(4)
1,408,423 (17,205)1,391,218 1,410,184 — — — — 
Real Estate Mortgages, Financing Lease Liabilities and Other760,040 (1,624)758,416 760,040 614,231 (1,825)612,406 614,231 
Accounts Receivable Securitization Program400,000 (467)399,533 400,000 400,000 (670)399,330 400,000 
Total Long-term Debt16,309,969 (116,413)16,193,556  13,836,364 (117,278)13,719,086 
Less Current Portion(699,320)— (699,320) (715,109)— (715,109) 
Long-term Debt, Net of Current Portion$15,610,649 $(116,413)$15,494,236  $13,121,255 $(117,278)$13,003,977  
(1)Collectively, the "Credit Agreement". The Credit Agreement consists of a revolving credit facility (the "Revolving Credit Facility"), a term loan A facility (the "Term Loan A") and a term loan B facility (the "Term Loan B"). The remaining amount available for borrowing under the Revolving Credit Facility as of September 30, 2025 was $2,504,559 (which represents the maximum availability as of such date). The weighted average interest rate in effect under the Revolving Credit Facility was 6.0% as of September 30, 2025.
(2)Each as defined in Note 7 to Notes to Consolidated Financial Statements included in our Annual Report.
(3)Collectively, the "Parent Notes". Iron Mountain Incorporated ("IMI") is the direct obligor on the Parent Notes, which are fully and unconditionally guaranteed, on a senior basis, by the Note Guarantors. These guarantees are joint and several obligations of the Note Guarantors. The remainder of our subsidiaries do not guarantee the Parent Notes.
(4)The fair value (Level 2 of the fair value hierarchy described in Note 2.p. to Notes to Consolidated Financial Statements included in our Annual Report) of this debt instrument is based on a quoted market price for comparable notes on September 30, 2025.
On September 10, 2025, IMI completed a private offering of:
SERIES OF NOTESAGGREGATE PRINCIPAL AMOUNTMATURITY DATEINTEREST PAYMENT DUE
PAR CALL DATE(1)
Euro Notes€1,200,000 January 15, 2034January 15 and July 15September 10, 2028
(1)We may redeem the Euro Notes at any time, at our option, in whole or in part. Prior to the par call date, we may redeem the Euro Notes at the redemption price or make-whole premium specified in the indenture governing the Euro Notes, together with accrued and unpaid interest to, but excluding, the redemption date. On or after the par call date, we may redeem the Euro Notes at a price equal to 100% of the principal amount being redeemed, together with accrued and unpaid interest to, but excluding, the redemption date.