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v3.21.2

Subsequent Events - (Details) - USD ($) | Jul. 31, 2021 | Jul. 29, 2021 | Jun. 30, 2021 | Apr. 30, 2021 | Feb. 28, 2021 | Dec. 31, 2015
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Subsequent Event [Line Items] |  |  |  |  |  |
Stock repurchase program, additional authorized amount |  |  |  | $ 500,000,000.0 | $ 300,000,000.0 |
Stock repurchase program, authorized amount |  |  | $ 2,000,000,000.0 |  |  | $ 1,200,000,000
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 300,000,000 |  |  |
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Stock repurchase program, additional authorized amount |  | $ 800,000,000 |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 231,000,000 |  |  |  |  |

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

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + 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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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |