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Restructuring and Other Reorganization-Related Costs Prior Year Plans (Details) (Prior Year Restructuring Plans [Domain], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Prior Year Restructuring Plans [Domain]
 
Restructuring Reserve $ 0.9us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= ipg_PriorYearRestructuringPlansDomain