Retirement Plans, Postretirement and Postemployment Benefits - Net Periodic Benefit Cost Recognized in Comprehensive Earnings (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ (114.5)	$ (67.5)	$ 34.7
Prior service cost	48.1
Prior service (cost) credit	(4.9)	(0.8)	(0.7)
Actuarial (gain) loss	3.9	12.2	14.5
Settlement (charge) credit	(4.6)		(3.7)
Total	(79.8)	(80.5)	15.8
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	(2.0)	(0.6)	0.5
Prior service (cost) credit	0.9	0.8	0.8
Actuarial (gain) loss	0.2	0.1	0.2
Total	$ (0.9)	$ 0.3	$ 1.5