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Defined Benefit Plans - Reconciliation of Level Three Measurements (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 677.2
Ending balance	784.9	$ 677.2
Group annuity/insurance contracts (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	24.2	23.6
Actual return on assets related to assets still held	0.6	0.6
Ending balance	$ 24.8	$ 24.2

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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