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Summary of Change in Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
U.S. Benefit Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fees, commissions and other expense paid from plan assets $ 1.9 $ 1.5
Change in Plan Assets    
Fair value of plan assets, beginning of year 128.1 134.0
Actual return on plan assets 6.6 (3.3)
Company contribution 5.6 7.0
Benefits and expenses paid (9.2) (9.6)
Fair value of plan assets, end of year 131.1 128.1
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets 0.0 0.0
Non-U.S. Benefit Plan    
Change in Plan Assets    
Fair value of plan assets, beginning of year 54.3 59.0
Actual return on plan assets 6.2 0.8
Company contribution 1.3 1.1
Benefits and expenses paid (4.2) (3.5)
Fair value of plan assets, end of year 48.5 54.3
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets $ (9.1) $ (3.1)