Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11.2	$ 14.0	$ 13.1
Interest cost	16.4	14.9	15.4
Expected return on plan assets	(11.4)	(10.0)	(10.5)
Net actuarial (gain) loss	(12.4)	(18.0)	(3.1)
Net periodic benefit expense (income)	3.8	0.9	14.9
Non-US Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	6.6	7.8	5.3
Interest cost	4.1	3.9	5.3
Expected return on plan assets	(1.5)	(1.6)	(1.7)
Net actuarial (gain) loss	17.2	(2.4)	31.5
Net periodic benefit expense (income)	26.4	7.7	$ 40.4
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	0.2
Interest cost	$ 1.5	$ 1.5