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Defined Contribution and Defined Benefit Retirement Plans - Changes In Benefit Obligations Recognized In Accumulated Other Comprehensive Income (Loss) (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (losses) gains	$ 135.1	$ 52.5	$ (36.8)
Net actuarial losses	13.0	20.0	17.9
Prior service cost	0.1	0.2	0.2
Settlement loss	0.3
Total	$ 148.5	$ 72.7	$ (18.7)

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