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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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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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