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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net Income | $ 1,192.2 | $ 1,246.7 | $ 1,203.4
Cash flow hedge: |  |  |
Loss for the period | 0.0 | (48.9) | (5.6)
Amortization of loss included in interest expense | 5.3 | 4.0 | 0.0
Income tax effect | (2.1) | 18.7 | 2.3
Other comprehensive income (loss) | 3.2 | (26.2) | (3.3)
Defined benefit pension plans and postemployment arrangements: |  |  |
Unrecognized actuarial losses and prior service cost for the period | (12.2) | (18.3) | (7.8)
Amortization of prior service cost and actuarial losses included in periodic benefit expense | 16.1 | 14.0 | 14.8
Income tax effect | (1.7) | 1.6 | (2.8)
Other comprehensive income (loss) | 2.2 | (2.7) | 4.2
Available-for-sale securities: |  |  |
Unrealized gain for the period | 0.8 | 0.2 | 0.4
Income tax effect | (0.3) | (0.1) | (0.1)
Other comprehensive income (loss) | 0.5 | 0.1 | 0.3
Foreign currency translation adjustment | 412.7 | (319.4) | (427.2)
Other Comprehensive Income (Loss) | 418.6 | (348.2) | (426.0)
Comprehensive Income | 1,610.8 | 898.5 | 777.4
Comprehensive Income Attributed To Noncontrolling Interests | 129.4 | 90.5 | 80.7
Comprehensive Income - Omnicom Group Inc. | $ 1,481.4 | $ 808.0 | $ 696.7

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