XML 87 R64.htm IDEA: XBRL DOCUMENT
v3.20.4

Goodwill and Other Intangible Assets Estimated future amortization of other intangible assets (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Summary of Other Intangible Assets [Abstract] |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The estimated annual amortization expense for other intangible assets for the next five years as of December 31, 2020 is listed below.
|  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025
Estimated amortization expense |  | $ | 88.3 |  |  | $ | 83.8 |  |  | $ | 79.0 |  |  | $ | 77.3 |  |  | $ | 74.5 |

X
- Definition Summary of Other Intangible Assets [Abstract] + References No definition available. + Details
Name: | ipg_SummaryofOtherIntangibleAssetsAbstract
Namespace Prefix: | ipg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration