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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (63.7) |  | $ (54.6) |  | $ (10.5) |  | $ (92.8) |  | $ (104.7) |
Items of other comprehensive income (loss) before income taxes: |  |  |  |  |  |  |  |  |  |
Change in foreign currency translation adjustment | (16.2) |  | 43.9 |  | 39.7 |  | 24.4 |  | (94.2) |
Change in unrealized gain from marketable securities |  |  |  |  |  |  |  |  | 0.6 |
Change in unrealized loss from invested customer trust funds | (24.5) |  | (10.0) |  | (17.3) |  | (10.2) |  | (4.9) |
Change in pension liability adjustment | 8.7 | [1] | 7.6 | [1] | 13.8 | [2] | 13.6 | [2] | 14.5 | [2]
Other comprehensive income (loss) before income taxes | (32.0) |  | 41.5 |  | 36.2 |  | 27.8 |  | (84.0) |
Income tax benefit, net | (2.3) |  | (3.0) |  | (3.6) |  | 0.6 |  | (0.6) |
Other comprehensive income (loss) after income taxes | (29.7) |  | 44.5 |  | 39.8 |  | 27.2 |  | (83.4) |
Comprehensive income (loss) | (93.4) |  | (10.1) |  | 29.3 |  | (65.6) |  | (188.1) |
Comprehensive (loss) income attributable to noncontrolling interest | (0.5) |  | 0.2 |  | (0.9) |  | (0.5) |  |  |
Comprehensive income (loss) attributable to Ceridian | $ (92.9) |  | $ (10.3) |  | $ 30.2 |  | $ (65.1) |  | $ (188.1) |
[1] | The amount of the pension liability adjustment recognized in the condensed consolidated statements of operations within selling, general, and administrative expense was $9.0 and $7.8 during the nine months ended September 30, 2018, and 2017, respectively.
[2] | The amount of the pension liability adjustment recognized in the Consolidated Statements of Operations within selling, general, and administrative expense and income (loss) from discontinued operations was $10.1, $9.9 and $11.8 during the years ended December 31, 2017, 2016, and 2015, respectively.

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