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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net (loss) income available to IPG common stockholders	$ (14.1)	$ 24.7
Weighted-average number of common shares outstanding, Basic	383.4	391.7
Restricted stock, stock options and other equity awards	5.2	7.6
Weighted-average number of common shares outstanding, Diluted	383.4	399.3
Earnings per share, Basic	$ (0.04)	$ 0.06
Earnings per share, Diluted	$ (0.04)	$ 0.06

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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