Schedule of Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
UNITED STATES
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 55.3	$ 50.8
Accumulated benefit obligation	53.2	48.6
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation	44.0	39.1
Accumulated benefit obligation	39.9	35.6
Fair value of plan assets	$ 1.6	$ 1.4