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Pensions and Postretirement Benefits - Schedule of Fair Value of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Defined Benefit Plan Disclosure |  |
Defined benefit plan investment | $ 351.4 | $ 353.4
Mutual funds – U.S. equity |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan investment | 46.2 | 68.3
Mutual funds – international equity |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan investment | 30.6 | 46.9
Mutual funds - fixed income treasury and money market |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan investment | 273.5 | 237.0
Cash equivalents |  |
Defined Benefit Plan Disclosure |  |
Defined benefit plan investment | $ 1.1 | $ 1.2

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