v3.7.0.1
Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at the end of the year $ 32.1 $ 32.8  
Change in projected benefit obligation:      
Beginning projected benefit obligation 32.8 36.6  
Service cost     $ 0.1
Interest cost 1.3 1.3 0.8
Actuarial (gain) loss 0.3 (1.3)  
Benefits paid (1.4) (1.2)  
Effect of settlements (0.9) (2.6)  
Ending projected benefit obligation 32.1 32.8 36.6
Change in plan assets:      
Beginning fair value of plan assets 23.9 27.3  
Actual return on plan assets 1.1 (0.3)  
Employer contributions   0.7  
Benefits paid (1.4) (1.2)  
Effect of settlements (0.9) (2.6)  
Ending fair value of plan assets 22.7 23.9 27.3
Non-U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at the end of the year 52.9 49.6  
Change in projected benefit obligation:      
Beginning projected benefit obligation 52.1 56.8  
Service cost 1.2 1.2 1.2
Interest cost 1.7 1.7 2.1
Actuarial (gain) loss 8.3 (2.9)  
Benefits paid (1.7) (2.0)  
Other adjustments   1.7  
Exchange rate changes (6.5) (4.4)  
Ending projected benefit obligation 55.1 52.1 56.8
Change in plan assets:      
Beginning fair value of plan assets 27.6 29.2  
Actual return on plan assets 3.4 0.1  
Employer contributions 1.5 1.8  
Benefits paid (1.7) (2.0)  
Exchange rate changes (4.6) (1.5)  
Ending fair value of plan assets $ 26.2 $ 27.6 $ 29.2