Defined Contribution and Defined Benefit Retirement - Schedule of Rollforward of Change in Fair Value of Level 3 Assets (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]
Fair value at beginning of the year	$ 533.9
Fair value at end of the year	429.6	$ 533.9
Significant Unobservable Inputs (Level 3)
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]
Fair value at beginning of the year	320.5	314.8
Gain (loss) on assets held at end of year	(31.0)	15.2
Gain (loss) on assets sold during the year	(3.6)	0.4
Assets purchased	13.8	16.2
Assets sold	(15.5)	(14.8)
Transfers in (out)	(0.1)	13.9
Currency exchange rate fluctuations	(19.3)	(25.2)
Fair value at end of the year	$ 264.8	$ 320.5