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Guarantees (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Commitments and Contingencies Disclosure [Abstract] |  |
Parent company guarantees on lease obligations | $ 824.5 | $ 829.2
Parent company guarantees relating to credit facilities | 349.1 | 308.8
Cash pooling guarantees | 207.8 | $ 182.2
Assets pledged as security for parent company guarantees | $ 0.0 |

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- Definition Assets pledged as security for parent company guarantees + References No definition available. + Details
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Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Cash pooling guarantees + References No definition available. + Details
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Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the credit facilities guarantees or each group of similar guarantees. + References No definition available. + Details
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Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the lease guarantees. + References No definition available. + Details
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Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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