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v3.19.3.a.u2

Debt - Cash Pooling (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) cash_pool | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |
Number of cash pools | cash_pool |  | 2 |
QRS Cash Pool |  |  |
Debt Instrument [Line Items] |  |  |
Number of cash pools | cash_pool |  | 1 |
Gross Cash Position | $ 10,000,000 | $ 372,100,000 | $ 300,800,000
Outstanding Debit Balances |  | (369,000,000) | (298,800,000)
Net Cash Position |  | 3,100,000 | 2,000,000
TRS Cash Pool |  |  |
Debt Instrument [Line Items] |  |  |
Gross Cash Position |  | 319,800,000 | 281,500,000
Outstanding Debit Balances |  | (301,300,000) | (279,300,000)
Net Cash Position |  | $ 18,500,000 | $ 2,200,000

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- Definition Cash Pool Agreement, Borrowings, Maximum + References No definition available. + Details
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Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash Pool Agreement, Cash Position, Net + References No definition available. + Details
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Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cash Pool Agreement, Number Of Cash Pools + References No definition available. + Details
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Namespace Prefix: | irm_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Cash Pool Agreement, Outstanding Borrowings + References No definition available. + Details
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Namespace Prefix: | irm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |