Schedule of Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
UNITED STATES
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 43.1	$ 43.8
Accumulated benefit obligation	42.6	42.3
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation	34.0	29.9
Accumulated benefit obligation	32.5	28.6
Fair value of plan assets	$ 1.9	$ 2.1