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Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Debt and Credit Arrangements [Abstract]  
Line of Credit Facility, Expiration Date Dec. 12, 2018
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Line of Credit Facility, Increase (Decrease), Net 250.0us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
Line of Credit Facility, Amount Outstanding $ 200.0ipg_LineOfCreditFacilityLimitsOnLettersOfCredit
Line of Credit Facility, Covenant Compliance 3/31/2015