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Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | $ 64.9us-gaap_ValuationAllowancesAndReservesBalance |  | $ 59.0us-gaap_ValuationAllowancesAndReservesBalance |  | $ 55.4us-gaap_ValuationAllowancesAndReservesBalance |
Charges to costs and expenses | 7.4us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 12.6us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 16.3us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |
Reversals to other accounts | 0.1us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | [1] | 0.7us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | [1] | (0.2)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | [1]
Deductions: |  |  |  |  |  |
Dispositions | 0ipg_AllowanceForDoubtfulAccountsDeductionsForDispositions |  | 0ipg_AllowanceForDoubtfulAccountsDeductionsForDispositions |  | (0.4)ipg_AllowanceForDoubtfulAccountsDeductionsForDispositions |
Uncollectible accounts written off | (8.1)ipg_AllowanceForDoubtfulAccountsDeductionsForUncollectibleAccountsWrittenOff |  | (7.2)ipg_AllowanceForDoubtfulAccountsDeductionsForUncollectibleAccountsWrittenOff |  | (12.6)ipg_AllowanceForDoubtfulAccountsDeductionsForUncollectibleAccountsWrittenOff |
Foreign currency translation adjustment | (4.8)ipg_AllowanceForDoubtfulAccountsForeignCurrencyTranslationAdjustment |  | (0.2)ipg_AllowanceForDoubtfulAccountsForeignCurrencyTranslationAdjustment |  | 0.5ipg_AllowanceForDoubtfulAccountsForeignCurrencyTranslationAdjustment |
Balance at end of period | $ 59.5us-gaap_ValuationAllowancesAndReservesBalance |  | $ 64.9us-gaap_ValuationAllowancesAndReservesBalance |  | $ 59.0us-gaap_ValuationAllowancesAndReservesBalance |
[1] | Amounts primarily relate to miscellaneous other amounts and reclassifications.

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- Definition Allowance for doubtful accounts, Deductions for dispositions + References No definition available. + Details
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- Definition Allowance for doubtful accounts, Deductions for uncollectible accounts written off + References No definition available. + Details
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- Definition Allowance for doubtful accounts, Foreign currency translation adjustment + References No definition available. + Details
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- Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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