Defined contribution and defined benefit retirement - Schedule of Plans for which Accumulated Benefit Obligations Exceeds Plan Assets (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
United States
Plans for which the ABO exceeds plan assets:
Projected benefit obligations	$ 42.7	$ 43.4
Accumulated benefit obligations	42.7	43.4
Fair value of plan assets	40.3	39.1
Non U.S.
Plans for which the ABO exceeds plan assets:
Projected benefit obligations	463.1	403.5
Accumulated benefit obligations	452.9	392.4
Fair value of plan assets	$ 313.8	$ 276.0