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Retirement Plans - Reconciliation of Beginning and Ending Balances for Level 3 Assets of Plan Measured at Fair Value (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 262.8	$ 243.7
Fair value of plan assets at end of year	282.3	262.8
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	121.0	107.9
Settlements	(15.2)	(2.7)
Unrealized gain	18.4	15.8
Fair value of plan assets at end of year	$ 124.2	$ 121.0

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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