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Share Repurchase Program (Details) - USD ($) $ in Millions | Feb. 10, 2022 | Dec. 31, 2021
--- | --- | ---
Stock Repurchase Program, Authorized Amount | $ 400.0 |
2017 Share Repurchase Program |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 338.4

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

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=ipg_ShareRepurchaseProgramThreeMemberDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |