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Retirement Plans - Summary of Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total fair value	$ 282.3	$ 262.8	$ 243.7
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value	158.1	141.8
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value	$ 124.2	$ 121.0	$ 107.9

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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