Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
REVENUE	$ 7,537.1us-gaap_Revenues	$ 7,122.3us-gaap_Revenues	$ 6,956.2us-gaap_Revenues
OPERATING EXPENSES:
Salaries and related expenses	4,820.4us-gaap_LaborAndRelatedExpense	4,545.5us-gaap_LaborAndRelatedExpense	4,391.9us-gaap_LaborAndRelatedExpense
Office and general expenses	1,928.1us-gaap_GeneralAndAdministrativeExpense	1,917.9us-gaap_GeneralAndAdministrativeExpense	1,887.2us-gaap_GeneralAndAdministrativeExpense
Restructuring and other reorganization-related charges (reversals), net	0.2us-gaap_RestructuringCharges	60.6us-gaap_RestructuringCharges	(1.2)us-gaap_RestructuringCharges
Total operating expenses	6,748.7us-gaap_CostsAndExpenses	6,524.0us-gaap_CostsAndExpenses	6,277.9us-gaap_CostsAndExpenses
OPERATING INCOME	788.4us-gaap_OperatingIncomeLoss	598.3us-gaap_OperatingIncomeLoss	678.3us-gaap_OperatingIncomeLoss
EXPENSES AND OTHER INCOME:
Interest expense	(84.9)us-gaap_InterestExpense	(122.7)us-gaap_InterestExpense	(133.5)us-gaap_InterestExpense
Interest income	27.4us-gaap_InvestmentIncomeInterest	24.7us-gaap_InvestmentIncomeInterest	29.5us-gaap_InvestmentIncomeInterest
Other (expense) income, net	(10.2)us-gaap_OtherNonoperatingIncomeExpense	(32.3)us-gaap_OtherNonoperatingIncomeExpense	100.5us-gaap_OtherNonoperatingIncomeExpense
Total (expenses) and other income	(67.7)us-gaap_NonoperatingIncomeExpense	(130.3)us-gaap_NonoperatingIncomeExpense	(3.5)us-gaap_NonoperatingIncomeExpense
Income before income taxes	720.7	468.0	674.8
Provision for income taxes	216.5us-gaap_IncomeTaxExpenseBenefit	181.2us-gaap_IncomeTaxExpenseBenefit	213.3us-gaap_IncomeTaxExpenseBenefit
Income of consolidated companies	504.2	286.8	461.5
Equity in net income of unconsolidated affiliates	1.2	2.1	3.1
NET INCOME	505.4us-gaap_ProfitLoss	288.9us-gaap_ProfitLoss	464.6us-gaap_ProfitLoss
Net income attributable to noncontrolling interests	(28.3)	(21.0)	(17.9)
NET INCOME ATTRIBUTABLE TO IPG	477.1us-gaap_NetIncomeLoss	267.9us-gaap_NetIncomeLoss	446.7us-gaap_NetIncomeLoss
Dividends on preferred stock	0	(8.7)	(11.6)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS	$ 477.1	$ 259.2	$ 435.1
Earnings per share available to IPG common stockholders:
Basic	$ 1.14us-gaap_EarningsPerShareBasic	$ 0.62us-gaap_EarningsPerShareBasic	$ 1.01us-gaap_EarningsPerShareBasic
Diluted	$ 1.12us-gaap_EarningsPerShareDiluted	$ 0.61us-gaap_EarningsPerShareDiluted	$ 0.94us-gaap_EarningsPerShareDiluted
Weighted-average number of common shares outstanding:
Basic	419.2	421.1	432.5
Diluted	425.4	429.6	481.4
Dividends declared per common share	$ 0.38	$ 0.30	$ 0.24

Income before minority interests and equity investments.

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