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Employee Benefit Plans - Schedule of Other Comprehensive (Income) Loss Related to Pension Benefit Plans (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | [1] | Sep. 30, 2017 | [1] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Net actuarial (gain) loss | $ (8.7) | $ (7.6) | $ (13.8) | [2] | $ (13.6) | [2] | $ (14.5) | [2]
Tax expense |  |  | 0.0 |  | (0.1) |  | (0.2) |
Defined Benefit Pension Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Net actuarial (gain) loss |  |  | (3.0) |  | 9.5 |  | 2.2 |
Amortization of net actuarial gain |  |  | (12.8) |  | (12.5) |  | (13.3) |
Tax expense |  |  |  |  | 0.1 |  |  |
Other comprehensive income, net of tax |  |  | (15.8) |  | (2.9) |  | (11.1) |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Net actuarial (gain) loss |  |  | (0.7) |  | (1.4) |  | (4.5) |
Amortization of net actuarial gain |  |  | 2.7 |  | 2.6 |  | 2.0 |
Other comprehensive income, net of tax |  |  | $ 2.0 |  | $ 1.2 |  | $ (2.5) |
[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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