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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, 2017
Dec. 31, 2016
United States Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure    
Projected benefit obligation $ 56.0 $ 54.0
Accumulated benefit obligation 51.6 48.0
Foreign Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure    
Projected benefit obligation 39.4 34.3
Accumulated benefit obligation 34.7 30.1
Fair value of plan assets $ 1.3 $ 1.1