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Loss Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Loss Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss available to IPG common stockholders - basic and diluted	$ (1.8)us-gaap_NetIncomeLoss	$ (20.9)us-gaap_NetIncomeLoss
Weighted Average Number of Shares Outstanding, Basic and Diluted	411.1us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	422.8us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Loss Per Share, Basic and Diluted	$ 0.00us-gaap_EarningsPerShareBasicAndDiluted	$ (0.05)us-gaap_EarningsPerShareBasicAndDiluted

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Publisher SEC

-Name Regulation S-X (SX)

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

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