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Schedule of Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure    
Fair value of plan assets  
UNITED STATES    
Defined Benefit Plan Disclosure    
Projected benefit obligation 50.8 $ 56.0
Accumulated benefit obligation 48.6 51.6
Foreign Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure    
Projected benefit obligation 39.1 39.4
Accumulated benefit obligation 35.6 34.7
Fair value of plan assets $ 1.4 $ 1.3