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Debt (Tables) | 9 Months Ended
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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, 2025 |  |  | DECEMBER 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 Facility |  | 188,186 |  |  | (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 |
4 7/8% Notes due 2027(2)(3) |  | 1,000,000 |  |  | (2,844) |  |  | 997,156 |  |  | 995,000 |  |  |  | 1,000,000 |  |  | (3,910) |  |  | 996,090 |  |  | 972,500 |
5 1/4% 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 |
4 7/8% Notes due 2029(2)(3) |  | 1,000,000 |  |  | (5,786) |  |  | 994,214 |  |  | 983,750 |  |  |  | 1,000,000 |  |  | (6,871) |  |  | 993,129 |  |  | 945,000 |
5 1/4% 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 |
4 1/2% 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 |
5 5/8% Notes(2)(3) |  | 600,000 |  |  | (3,969) |  |  | 596,031 |  |  | 596,250 |  |  |  | 600,000 |  |  | (4,404) |  |  | 595,596 |  |  | 570,000 |
6 1/4% 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 |
4 3/4% 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 Other |  | 760,040 |  |  | (1,624) |  |  | 758,416 |  |  | 760,040 |  |  |  | 614,231 |  |  | (1,825) |  |  | 612,406 |  |  | 614,231 |
Accounts Receivable Securitization Program |  | 400,000 |  |  | (467) |  |  | 399,533 |  |  | 400,000 |  |  |  | 400,000 |  |  | (670) |  |  | 399,330 |  |  | 400,000 |
Total Long-term Debt |  | 16,309,969 |  |  | (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 NOTES | AGGREGATE PRINCIPAL AMOUNT | MATURITY DATE | INTEREST PAYMENT DUE | PAR CALL DATE(1)
Euro Notes | € | 1,200,000 |  | January 15, 2034 | January 15 and July 15 | September 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.

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