Pensions - Summary of Components of Net Postretirement Pensions Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
U.S. Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2.0	$ 1.9
Amortization of actuarial loss	1.4	1.6
Expected return on plan assets	(2.6)	(2.5)
Net postretirement pension expense	0.8	1.0
Non-U.S. Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.5	0.5
Amortization of actuarial loss	0.2	0.2
Expected return on plan assets	(0.6)	(0.7)
Net postretirement pension expense	$ 0.1	$ 0.0