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Debt (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Debt Disclosure [Abstract]    
Schedule of Carrying Amount and Fair Value of Long-term Debt Instruments
Long-term debt is as follows:
 MARCH 31, 2022DECEMBER 31, 2021
 
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$650,000 $(10,096)$639,904 $650,000 $— $(5,174)$(5,174)$— 
Term Loan A250,000 — 250,000 250,000 203,125 — 203,125 203,125 
Term Loan B671,153 (4,683)666,470 672,000 672,847 (4,995)667,852 675,500 
Australian Dollar Term Loan (the “AUD Term Loan”)226,517 (517)226,000 229,130 223,182 (656)222,526 223,530 
UK Bilateral Revolving Credit Facility (the “UK Bilateral Facility”)183,870 (525)183,345 183,870 189,168 (709)188,459 189,168 
37/8% GBP Senior Notes due 2025 (the “GBP Notes”)
525,342 (3,554)521,788 521,560 540,481 (3,912)536,569 542,508 
47/8% Senior Notes due 2027 (the “47/8% Notes due 2027”)(1)
1,000,000 (7,821)992,179 987,500 1,000,000 (8,176)991,824 1,030,000 
51/4% Senior Notes due 2028 (the “51/4% Notes due 2028”)(1)
825,000 (7,085)817,915 814,688  825,000 (7,380)817,620 862,125 
5% Senior Notes due 2028 (the “5% Notes due 2028”)(1)
500,000 (4,582)495,418 485,000  500,000 (4,763)495,237 513,750 
47/8% Senior Notes due 2029 (the “47/8% Notes due 2029”)(1)
1,000,000 (10,849)989,151 950,000 1,000,000 (11,211)988,789 1,022,500 
51/4% Senior Notes due 2030 (the “51/4 Notes due 2030”)(1)
1,300,000 (12,535)1,287,465 1,261,000 1,300,000 (12,911)1,287,089 1,355,250 
41/2% Senior Notes due 2031 (the “41/2% Notes”)(1)
1,100,000 (11,093)1,088,907 1,009,250 1,100,000 (11,404)1,088,596 1,094,500 
5% Senior Notes due 2032 (the “5% Notes due 2032”)750,000 (13,499)736,501 705,000   750,000 (13,782)736,218 767,813 
55/8% Senior Notes due 2032 (the “55/8% Notes”)(1)
600,000 (6,001)593,999 590,250 600,000 (6,147)593,853 637,500 
Real Estate Mortgages, Financing Lease Liabilities and Other446,394 (795)445,599 446,394 460,648 (840)459,808 460,648 
Accounts Receivable Securitization Program300,000 (450)299,550 300,000 — (450)(450)— 
Total Long-term Debt10,328,276 (94,085)10,234,191  9,364,451 (92,510)9,271,941 
Less Current Portion(91,180)— (91,180) (310,084)656 (309,428) 
Long-term Debt, Net of Current Portion$10,237,096 $(94,085)$10,143,011  $9,054,367 $(91,854)$8,962,513  
(1) Collectively, the “Parent Notes”.
Long-term debt is as follows:
 DECEMBER 31, 2021DECEMBER 31, 2020
 DEBT (INCLUSIVE OF DISCOUNT)UNAMORTIZED DEFERRED FINANCING COSTSCARRYING AMOUNTFAIR
VALUE		DEBT (INCLUSIVE OF DISCOUNT)UNAMORTIZED DEFERRED FINANCING COSTSCARRYING AMOUNTFAIR
VALUE
Revolving Credit Facility(1)
$— $(5,174)$(5,174)$— $— $(8,620)$(8,620)$— 
Term Loan A(1)
203,125 — 203,125 203,125 215,625 — 215,625 215,625 
Term Loan B(1)(2)
672,847 (4,995)667,852 675,500 679,621 (6,244)673,377 680,750 
Australian Dollar Term Loan (the “AUD Term Loan”)(3)(4)
223,182 (656)222,526 223,530 243,152 (1,624)241,528 244,014 
UK Bilateral Revolving Credit Facility(4)
189,168 (709)188,459 189,168 191,101 (1,307)189,794 191,101 
37/8% GBP Senior Notes due 2025 (the “GBP Notes “)(5)(7)(8)
540,481 (3,912)536,569 542,508 546,003 (4,983)541,020 553,101 
47/8% Senior Notes due 2027 (the “47/8% Notes due 2027”)(5)(6)(7)
1,000,000 (8,176)991,824 1,030,000 1,000,000 (9,598)990,402 1,046,250 
51/4% Senior Notes due 2028 (the “51/4% Notes due 2028”)(5)(6)(7)
825,000 (7,380)817,620 862,125 825,000 (8,561)816,439 868,313 
5% Senior Notes due 2028 (the “5% Notes due 2028”)(5)(6)(7)
500,000 (4,763)495,237 513,750 500,000 (5,486)494,514 523,125 
47/8% Senior Notes due 2029 (the “47/8% Notes due 2029”)(5)(6)(7)
1,000,000 (11,211)988,789 1,022,500 1,000,000 (12,658)987,342 1,050,000 
51/4% Senior Notes due 2030 (the “51/4% Notes due 2030”)(5)(6)(7)
1,300,000 (12,911)1,287,089 1,355,250 1,300,000 (14,416)1,285,584 1,400,750 
41/2% Senior Notes due 2031 (the “41/2% Notes”)(5)(6)(7)
1,100,000 (11,404)1,088,596 1,094,500 1,100,000 (12,648)1,087,352 1,138,500 
5% Senior Notes due 2032 (the “5% Notes due 2032”)(5)(7)(9)
750,000 (13,782)736,218 767,813 — — — — 
55/8% Senior Notes due 2032 (the “55/8% Notes”)(5)(6)(7)
600,000 (6,147)593,853 637,500 600,000 (6,727)593,273 660,000 
Real Estate Mortgages, Financing Lease Liabilities and Other(10)
460,648 (840)459,808 460,648 511,922 (1,086)510,836 511,922 
Accounts Receivable Securitization Program(11)
— (450)(450)— 85,000 (152)84,848 85,000 
Total Long-term Debt9,364,451 (92,510)9,271,941 8,797,424 (94,110)8,703,314 
Less Current Portion(310,084)656 (309,428)(193,759)— (193,759)
Long-term Debt, Net of Current Portion$9,054,367 $(91,854)$8,962,513 $8,603,665 $(94,110)$8,509,555 
(1)The capital stock or other equity interests of most of our United States subsidiaries, and up to 66% of the capital stock or other equity interests of most of our first-tier foreign subsidiaries, are pledged to secure these debt instruments, together with all intercompany obligations (including promissory notes) of subsidiaries owed to us or to one of our United States subsidiary guarantors. In addition, Iron Mountain Canada Operations ULC (“Canada Company”) has pledged 66% of the capital stock of its subsidiaries, and all intercompany obligations (including promissory notes) owed to or held by it, to secure the Canadian dollar subfacility under the Revolving Credit Facility. The fair value (Level 3 of fair value hierarchy described at Note 2.o.) of these debt instruments approximates the carrying value (as borrowings under these debt instruments are based on current variable market interest rates (plus a margin that is subject to change based on our consolidated leverage ratio)), as of December 31, 2021 and 2020.
(2)The amount of debt for the Term Loan B (as defined below) reflects an unamortized original issue discount of $903 and $1,129 as of December 31, 2021 and 2020, respectively.
(3)The amount of debt for the AUD Term Loan reflects an unamortized original issue discount of $348 and $862 as of December 31, 2021 and 2020, respectively.
(4)The fair value (Level 3 of fair value hierarchy described at Note 2.o.) of this debt instrument approximates the carrying value as borrowings under this debt instrument are based on a current variable market interest rate.
(5)The fair values (Level 1 of fair value hierarchy described at Note 2.o.) of these debt instruments are based on quoted market prices for these notes on December 31, 2021 and 2020, respectively.
(6)Collectively, the “Parent Notes". IMI is the direct obligor on the Parent Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI’s direct and indirect 100% owned United States subsidiaries that represent the substantial majority of our United States operations (the “Guarantors”). These guarantees are joint and several obligations of the Guarantors. The remainder of our subsidiaries do not guarantee the Parent Notes.
(7)Collectively, the “Unregistered Notes". The Unregistered Notes have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or under the securities laws of any other jurisdiction. Unless they are registered, the Unregistered Notes may be offered only in transactions that are exempt from registration under the Securities Act or the securities laws of any other jurisdiction.
(8)Iron Mountain (UK) PLC (“IM UK”) is the direct obligor on the GBP Notes, which are fully and unconditionally guaranteed, on a senior basis, by IMI and the Guarantors. These guarantees are joint and several obligations of IMI and the Guarantors.
(9)Iron Mountain Information Management Services, Inc. (“IMIM Services”) is the direct obligor on the 5% Notes due 2032, which are fully and unconditionally guaranteed, on a senior basis, by IMI and the other Guarantors. These guarantees are joint and several obligations of IMI and such Guarantors.
(10) We believe the fair value (Level 3 of fair value hierarchy described at Note 2.o.) of this debt approximates its carrying value. This debt includes the following:
 DECEMBER 31, 2021DECEMBER 31, 2020
Real estate mortgages(i)
$58,933 $71,673 
Financing lease liabilities(ii)
356,729 366,311 
Other notes and other obligations(iii)
44,986 73,938 
 $460,648 $511,922 
(i)Bear interest at approximately 3.6% and 3.3% at December 31, 2021 and 2020, respectively, and includes $50,000 outstanding under our Mortgage Securitization Program at both December 31, 2021 and 2020.
(ii)Bear a weighted average interest rate of 5.9% at both December 31, 2021 and 2020.
(iii)These notes and other obligations, which were assumed by us as a result of certain acquisitions bear a weighted average interest rate of 10.7% at both December 31, 2021 and 2020.
(11) The Accounts Receivable Securitization Special Purpose Subsidiaries are the obligors under this program. We believe the fair value (Level 3 of fair value hierarchy described at Note 2.o.) of this debt approximates its carrying value.
Schedule of Net Cash Position in Cash Pool Agreements
The approximate amount of the net cash position for our cash pools and the approximate amount of the gross position and outstanding debit balances for each of these pools as of March 31, 2022 and December 31, 2021 are as follows:
MARCH 31, 2022DECEMBER 31, 2021
 
GROSS CASH
POSITION
OUTSTANDING
DEBIT BALANCES
NET CASH
POSITION
GROSS CASH
POSITION
OUTSTANDING
DEBIT BALANCES
NET CASH
POSITION
BMG QRS Cash Pool$554,600 $(553,100)$1,500 $552,900 $(552,100)$800 
BMG TRS Cash Pool552,900 (551,700)1,200 606,000 (603,900)2,100 
JPM QRS Cash Pool13,600 (13,500)100 9,400 (9,200)200 
JPM TRS Cash Pool17,000 (16,600)400 12,000 (9,900)2,100 
The approximate amount of the net cash position, gross position and outstanding debit balances for each of our cash pools as of December 31, 2021 and 2020 were as follows:
DECEMBER 31, 2021DECEMBER 31, 2020
 GROSS CASH POSITIONOUTSTANDING DEBIT BALANCESNET CASH POSITIONGROSS CASH POSITIONOUTSTANDING DEBIT BALANCESNET CASH POSITION
BMG QRS Cash Pool$552,900 $(552,100)$800 $448,700 $(447,400)$1,300 
BMG TRS Cash Pool606,000 (603,900)2,100 555,500 (553,500)2,000 
JPM QRS Cash Pool9,400 (9,200)200 — — — 
JPM TRS Cash Pool12,000 (9,900)2,100 — — —