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v2.4.1.9

Earnings Per Share Basic and Diluted (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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.

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