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Retirement Plans - Summary of Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total fair value	$ 243.7	$ 220.0	$ 219.4
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value	135.8	125.1
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value	$ 107.9	$ 94.9	$ 111.9

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- Definition

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+ References

No definition available.

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- Definition

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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-Publisher FASB
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