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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |
NET INCOME | $ 49.2 |  | $ 67.7 | $ 76.8 |  | $ 127.5
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |
Foreign currency translation adjustments | 24.0 |  | 37.3 | (89.3) |  | 16.1
Available-for-sale securities: |  |  |  |  |  |
Changes in market value of available-for sale securities | (0.1) |  | (40.8) | 0.7 |  | 94.7
Less: recognition of previously unrealized (gains) losses included in net income | 0 |  | 0 | (1.4) |  | 0.6
Available-for-sale securities, Income tax effect | 0 |  | 15.8 | 0.2 |  | (34.8)
Available-for-sale securities, net of tax | (0.1) |  | (25.0) | (0.5) |  | 60.5
Derivative instruments: |  |  |  |  |  |
Changes in fair value of derivative instruments | 0 |  | (3.6) | 0 |  | (22.2)
Less: recognition of previously unrealized losses in net income | 0.4 |  | 0 | 1.3 |  | 0
Derivative instruments, Income tax effect | (0.1) |  | 1.5 | (0.5) |  | 9.2
Derivative instruments, net of tax | 0.3 |  | (2.1) | 0.8 |  | (13.0)
Defined benefit pension and other postretirement plans: |  |  |  |  |  |
Net actuarial gains for the period | 0 |  | 0 | 0 |  | 1.0
Less: amortization of unrecognized losses, transition obligation and prior service cost included in net income | 2.7 | [1] | 2.0 | 8.2 | [1] | 5.7
Other | (0.2) |  | (0.3) | (0.9) |  | (0.4)
Defined benefit pension and other postretirement plans, Income tax effect | (0.8) |  | (0.6) | (2.8) |  | (2.3)
Defined benefit pension and other postretirement plans, net of tax | 1.7 |  | 1.1 | 4.5 |  | 4.0
Other comprehensive income (loss), net of tax | 25.9 |  | 11.3 | (84.5) |  | 67.6
Total Comprehensive Income (Loss) | 75.1 |  | 79.0 | (7.7) |  | 195.1
Less: comprehensive income (loss) attributable to noncontrolling interests | 0.7 |  | (3.3) | (1.2) |  | (3.5)
Comprehensive Income (Loss) Attributable to IPG | $ 74.4 |  | $ 82.3 | $ (6.5) |  | $ 198.6
[1] | These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 9 for further information.

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