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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |
NET INCOME | $ 103.7 |  | $ 86.1 |  | $ 81.3 |  | $ 27.6 |
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |
Foreign currency translation adjustments | 25.5 |  | (74.5) |  | 24.5 |  | (113.3) |
Less: reclassification adjustments recognized in net income | 0 | [1] | 0 | [1] | (0.9) | [1] | 0 | [1]
Foreign Currency Transaction and Translation Adjustment, Net of Tax | 25.5 |  | (74.5) |  | 23.6 |  | (113.3) |
Available-for-sale securities: |  |  |  |  |  |  |  |
Changes in market value of available-for sale securities | 0.1 |  | 0.4 |  | 0.2 |  | 0.8 |
Less: recognition of previously unrealized gains included in net income | 0 | [1] | (0.4) | [1] | 0 | [1] | (1.4) | [1]
Income tax effect | 0 |  | 0.1 |  | 0 |  | 0.2 |
Available-for-sale securities, net of tax | 0.1 |  | 0.1 |  | 0.2 |  | (0.4) |
Derivative instruments: |  |  |  |  |  |  |  |
Changes in fair value of derivative instruments | 0 |  | 0 |  | (0.6) |  | 0 |
Less: recognition of previously unrealized losses included in net income | 0.5 | [1] | 0.5 | [1] | 0.9 | [1] | 0.9 | [1]
Income tax effect | (0.2) |  | (0.2) |  | (0.1) |  | (0.4) |
Derivative instruments, net of tax | 0.3 |  | 0.3 |  | 0.2 |  | 0.5 |
Defined benefit pension and other postretirement plans: |  |  |  |  |  |  |  |
Net actuarial gains for the period | 0 |  | 1.1 |  | (0.3) |  | 0 |
Less: amortization of unrecognized losses, transition obligation and prior service cost included in net income | 2.4 | [1] | 2.7 | [1] | 5.0 | [1] | 5.5 | [1]
Other | (0.1) |  | (0.2) |  | (0.2) |  | (0.7) |
Income tax effect | (0.7) |  | (1.3) |  | (1.3) |  | (2.0) |
Defined benefit pension and other postretirement plans, net of tax | 1.6 |  | 2.3 |  | 3.2 |  | 2.8 |
Other comprehensive income (loss), net of tax | 27.5 |  | (71.8) |  | 27.2 |  | (110.4) |
TOTAL COMPREHENSIVE INCOME (LOSS) | 131.2 |  | 14.3 |  | 108.5 |  | (82.8) |
Less: comprehensive income (loss) attributable to noncontrolling interests | 4.0 |  | 1.5 |  | 1.9 |  | (1.9) |
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO IPG | $ 127.2 |  | $ 12.8 |  | $ 106.6 |  | $ (80.9) |
[1] | These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 10 for further information.

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Namespace Prefix: | us-gaap_
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