Retirement Plans, Postretirement and Postemployment Benefits - Schedule of Funded Status (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit credit (cost)	$ 209.5	$ 64.8
Pension
Defined Benefit Plan Disclosure [Line Items]
Funded status of the plan at end of year	209.5	64.8
Accrued benefit credit (cost)	209.5	64.8
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Funded status of the plan at end of year	(8.9)	(11.4)
Accrued benefit credit (cost)	$ (8.9)	$ (11.4)