Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14.0	$ 13.1	$ 15.6
Interest cost	14.9	15.4	14.3
Expected return on plan assets	(10.0)	(10.5)	(9.7)
Amortization of prior year service cost (benefit)	0.0	0.0	0.4
Net actuarial (gain) loss	(18.0)	(3.1)	(18.3)
Net periodic benefit expense (income)	0.9	14.9	2.3
Non-US Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	9.6	7.4	8.4
Interest cost	14.2	17.3	17.9
Expected return on plan assets	(15.6)	(15.9)	(15.2)
Amortization of prior year service cost (benefit)	0.0	0.0	(0.2)
Net actuarial (gain) loss	(0.8)	50.3	(30.0)
Net periodic benefit expense (income)	7.4	59.1	(19.1)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	0.2	0.3
Interest cost	1.5	1.7	1.9
Amortization of prior year service cost (benefit)	0.0	0.0	(0.8)
Net actuarial (gain) loss	(0.9)	0.3	(15.9)
Net periodic benefit expense (income)	$ 0.8	$ 2.2	$ (14.5)