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Employee Benefit Plans - Schedule of Other Comprehensive (Income) Loss Related to Pension Benefit Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net actuarial (gain) loss | [1] | $ (21.2) | $ (9.8) | $ 7.6
Tax expense |  | (5.7) | (2.4) | (0.0)
Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net actuarial (gain) loss |  | (8.0) | 1.0 | 21.4
Amortization of net actuarial gain (loss) |  | (15.7) | (12.7) | (14.2)
Tax expense |  | 6.4 | 2.9 |
Other comprehensive loss (income), net of tax |  | (17.3) | (8.8) | 7.2
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net actuarial (gain) loss |  |  | (0.7) | (2.1)
Amortization of net actuarial gain (loss) |  | 2.5 | 2.6 | 2.5
Tax expense |  | (0.7) | (0.5) |
Other comprehensive loss (income), net of tax |  | $ 1.8 | $ 1.4 | $ 0.4
[1] | The amount of the pension liability adjustment recognized in the Consolidated Statements of Operations within other expense (income), net was $13.2 million, $10.1 million, and $11.7 million during the years ended December 31, 2020, 2019, and 2018, respectively.

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