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Earnings Per Share Basic and Diluted (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income available to IPG common stockholders - basic $ 308.9us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 89.7us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 99.4us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (20.9)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 193.1us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 45.4us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 79.9us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (59.2)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 477.1us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 259.2us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 435.1us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dividends on preferred stock                 0ipg_PreferredStockDividendsEffectOfDilutiveSecurities 0ipg_PreferredStockDividendsEffectOfDilutiveSecurities 11.6ipg_PreferredStockDividendsEffectOfDilutiveSecurities
Net income available to IPG common stockholders - diluted                 477.1us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 260.0us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 451.1us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted-average number of common shares outstanding - basic                 419.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 421.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 432.5us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Restricted stock, stock options and other equity awards                 6.2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 5.2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 7.2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Preferred stock outstanding 2                 0us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock [1] 0us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock 16.9us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Weighted-average number of common shares outstanding - diluted                 425.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 429.6us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 481.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per share available to IPG common stockholders - basic $ 0.75us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic $ (0.05)us-gaap_EarningsPerShareBasic $ 0.45us-gaap_EarningsPerShareBasic $ 0.11us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ (0.14)us-gaap_EarningsPerShareBasic $ 1.14us-gaap_EarningsPerShareBasic $ 0.62us-gaap_EarningsPerShareBasic $ 1.01us-gaap_EarningsPerShareBasic
Earnings per share available to IPG common stockholders - diluted $ 0.73us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted $ 0.23us-gaap_EarningsPerShareDiluted $ (0.05)us-gaap_EarningsPerShareDiluted $ 0.44us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ 0.18us-gaap_EarningsPerShareDiluted $ (0.14)us-gaap_EarningsPerShareDiluted $ 1.12us-gaap_EarningsPerShareDiluted $ 0.61us-gaap_EarningsPerShareDiluted $ 0.94us-gaap_EarningsPerShareDiluted
4.75% Convertible Notes                      
Interest on convertible debt                 0us-gaap_InterestOnConvertibleDebtNetOfTax
/ us-gaap_LongtermDebtTypeAxis
= ipg_ConvertibleDebtSecuritiesTwoMember		 [2] 0.8us-gaap_InterestOnConvertibleDebtNetOfTax
/ us-gaap_LongtermDebtTypeAxis
= ipg_ConvertibleDebtSecuritiesTwoMember		 [2] 4.1us-gaap_InterestOnConvertibleDebtNetOfTax
/ us-gaap_LongtermDebtTypeAxis
= ipg_ConvertibleDebtSecuritiesTwoMember
Convertible debt securities                 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= ipg_ConvertibleDebtSecuritiesTwoMember		 [2] 3.3us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= ipg_ConvertibleDebtSecuritiesTwoMember		 [2] 16.9us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= ipg_ConvertibleDebtSecuritiesTwoMember
4.25% Convertible Notes                      
Interest on convertible debt                 $ 0us-gaap_InterestOnConvertibleDebtNetOfTax
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember		 [2] $ 0us-gaap_InterestOnConvertibleDebtNetOfTax
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember		 [2] $ 0.3us-gaap_InterestOnConvertibleDebtNetOfTax
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
Convertible debt securities                 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember		 [2] 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember		 [2] 7.9us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtSecuritiesMember
[1] We converted all of our 5 1/4% Series B Cumulative Convertible Perpetual Preferred Stock (the "Series B Preferred Stock") into common stock in October 2013. For purposes of calculating diluted earnings per share for 2013, the potentially dilutive shares would have been pro-rated based on the period they were outstanding but were antidilutive.
[2] We retired all of our outstanding 4.75% Notes and 4.25% Convertible Senior Notes due 2023 in March 2013 and March 2012, respectively. See Note 2 for further information. For purposes of calculating diluted earnings per share for 2013 and 2012, the potentially dilutive shares are pro-rated based on the period they were outstanding.