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Retirement Plans - Summary of Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Total fair value	$ 262.8	$ 243.7	$ 220.0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value	141.8	135.8
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value	$ 121.0	$ 107.9	$ 94.9

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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.

+ References

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