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Equity - Narrative (Details) - USD ($) $ in Billions | 1 Months Ended | 55 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2015
Stockholders' Equity Note [Abstract] |  |  |
Stock repurchase program, authorized amount |  |  | $ 1.2
Stock repurchase program, additional authorized amount | $ 1.0 | $ 5.8 |
Stock repurchase program, remaining authorized repurchase amount | $ 1.3 | $ 1.3 |

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- Definition Stock Repurchase Program, Additional Authorized Amount + References No definition available. + Details
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Namespace Prefix: | it_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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Period Type: | instant

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- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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