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Share Repurchase Program (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Number of shares repurchased | 14.9us-gaap_TreasuryStockSharesAcquired | 31.8us-gaap_TreasuryStockSharesAcquired | 32.7us-gaap_TreasuryStockSharesAcquired
Aggregated cost, including fees | $ 275.1us-gaap_TreasuryStockValueAcquiredCostMethod | $ 481.8us-gaap_TreasuryStockValueAcquiredCostMethod | $ 350.5us-gaap_TreasuryStockValueAcquiredCostMethod
Average price per share, including fees | $ 18.41us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 15.17us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 10.72us-gaap_TreasuryStockAcquiredAverageCostPerShare
2014 Share Repurchase Program |  |  |
Share repurchase program, initial authorized amount | 300.0us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = ipg_ShareRepurchaseProgramOneMember |  |
Remaining available for repurchase | 143.6ipg_ShareRepurchaseProgramRemainingAmountforRepurchase / us-gaap_ShareRepurchaseProgramAxis = ipg_ShareRepurchaseProgramOneMember |  |
2013 Share Repurchase Program |  |  |
Share repurchase program, initial authorized amount |  | 300.0us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = ipg_ShareRepurchaseProgramTwoMember |
Share repurchase program, increased authorized amount |  | 500.0ipg_StockRepurchaseProgramAuthorizedAmountAfterProgramIncrease / us-gaap_ShareRepurchaseProgramAxis = ipg_ShareRepurchaseProgramTwoMember |
2012 Share Repurchase Program |  |  |
Share repurchase program, initial authorized amount |  |  | 300.0us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = ipg_ShareRepurchaseProgramThreeMemberDomain
Share repurchase program, increased authorized amount |  |  | $ 400.0ipg_StockRepurchaseProgramAuthorizedAmountAfterProgramIncrease / us-gaap_ShareRepurchaseProgramAxis = ipg_ShareRepurchaseProgramThreeMemberDomain

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- Definition The remaining amount authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan after program increase. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Details
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