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Future minimum lease payments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Operating Leases, Rent Expense | $ 357.7us-gaap_LeaseAndRentalExpense | $ 366.1us-gaap_LeaseAndRentalExpense | $ 358.5us-gaap_LeaseAndRentalExpense
Rent Obligations, due 2015 | 328.4ipg_OperatingLeasesFutureMinimumPaymentsDueGrossRentCurrent |  |
Rent Obligations, due 2016 | 288.9ipg_OperatingLeasesFutureMinimumPaymentsGrossRentDueInTwoYears |  |
Rent Obligations, due 2017 | 248.3ipg_OperatingLeasesFutureMinimumPaymentsGrossRentDueInThreeYears |  |
Rent Obligations, due 2018 | 222.3ipg_OperatingLeasesFutureMinimumPaymentsGrossRentDueInFourYears |  |
Rent Obligations, due 2019 | 198.9ipg_OperatingLeasesFutureMinimumPaymentsGrossRentDueInFiveYears |  |
Rent Obligations, due thereafter | 845.1ipg_OperatingLeasesFutureMinimumPaymentsGrossRentDueThereafter |  |
Total Rent Obligations | 2,131.9ipg_OperatingLeasesFutureMinimumPaymentsDueGrossRent |  |
Sublease Rental Income, due 2015 | (8.4)ipg_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsCurrent |  |
Sublease Rental Income, due 2016 | (2.8)ipg_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInTwoYears |  |
Sublease Rental Income, due 2017 | (1.1)ipg_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInThreeYears |  |
Sublease Rental Income, due 2018 | (0.1)ipg_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInFourYears |  |
Sublease Rental Income, due 2019 | 0ipg_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInFiveYears |  |
Sublease Rental Income, due thereafter | 0ipg_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueThereafter |  |
Total Sublease Rental Income | (12.4)us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals |  |
Net Rent, due 2015 | 320.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
Net Rent, due 2016 | 286.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |
Net Rent, due 2017 | 247.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |
Net Rent, due 2018 | 222.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |
Net Rent, due 2019 | 198.9us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |
Net Rent, due thereafter | 845.1us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |
Total Net Rent | 2,119.5us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |
Operating Leases, Rent Expense, Sublease Rentals | 6.1us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | 16.1us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | 17.5us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Operating Leases, Rent Expense, Net | $ 351.6us-gaap_OperatingLeasesRentExpenseNet | $ 350.0us-gaap_OperatingLeasesRentExpenseNet | $ 341.0us-gaap_OperatingLeasesRentExpenseNet

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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