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Pensions - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]      
Payments for repurchase of common stock   $ 33.1 $ 5.0
Actuarial losses recognized $ 0.4    
Common Stock      
Defined Benefit Plan Disclosure [Line Items]      
Payments for repurchase of common stock   3.6  
U.S. Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefits paid   3.1 3.3
Estimated future employer contributions in current year   7.2  
Non-U.S. Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefits paid   0.7 $ 1.1
Estimated future employer contributions in current year   $ 1.4