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Financial Covenants (Details) | 9 Months Ended
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Sep. 30, 2011
Q3 2011 |  |
Interest coverage ratio (not less than): | 5.00x | [1]
Leverage ratio (not greater than): | 3.00x | [2]
Q4 2011 & Thereafter |  |
Interest coverage ratio (not less than): | 5.00x | [1]
Leverage ratio (not greater than): | 2.75x | [2]
[1] | The interest coverage ratio is defined as EBITDA, as defined in the Credit Agreement, to net interest expense plus cash dividends on convertible preferred stock for the four quarters then ended.
[2] | The leverage ratio is defined as debt as of the last day of such fiscal quarter to EBITDA, as defined in the Credit Agreement, for the four quarters then ended.

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- Definition Interest coverage ratio covenant in the Credit Agreement that requires that we maintain a minimum ratio of EBITDA, as defined in the Credit Agreement, to net interest expense plus cash dividends on convertible preferred stock for the four quarters then ended. + Details
Name: | ipg_InterestCoverageRatioMinimum
Namespace Prefix: | ipg
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Leverage ratio covenant in the Credit Agreement that requires that we maintain a maximum ratio of debt as of the last day of such fiscal quarter to EBITDA, as defined in the Credit Agreement, for the four quarters then ended. + Details
Name: | ipg_LeverageRatioMaximum
Namespace Prefix: | ipg
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration