Schedule of Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
United States Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 54.0	$ 53.3
Accumulated benefit obligation	48.0	47.3
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation	34.3	35.2
Accumulated benefit obligation	30.1	29.5
Fair value of plan assets	$ 1.1	$ 1.0