Defined Contribution and Defined Benefit Retirement - Schedule of Changes in Plan Assets and Benefit Obligations Recognized in 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
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Net actuarial gains (losses)	$ 134.1	$ 50.7	$ (37.7)
Amortization of unrecognized net actuarial losses	14.7	21.6	19.4
Amortization of unrecognized prior service cost (credit)	0.1	0.2	0.2
Settlements	(0.4)
Total	$ 149.3	$ 72.5	$ (18.1)