Employee Benefit Plans - Components of Net Periodic Defined Benefit Pension Benefit Cost (Credit) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2.9	$ 2.4	$ 2.7
Expected return on plan assets	(4.0)	(4.9)	(4.5)
Amortization of unrecognized net actuarial loss	1.2	1.6	1.6
Total	0.1	(0.9)	(0.2)
Foreign Pension Plan Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	9.9	13.1	10.4
Interest cost	22.2	21.6	22.8
Settlement gain	(0.3)
Curtailment gain (loss)	0.1	7.3
Expected return on plan assets	(20.6)	(18.9)	(17.4)
Amortization of unrecognized prior service credit	0.5	1.1	1.1
Amortization of unrecognized net transition obligations		0.4	0.4
Amortization of unrecognized net actuarial loss	10.1	12.5	8.0
Total	21.9	37.1	25.3
OPEB
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.3	0.3
Interest cost	0.6	0.7	0.8
Curtailment gain (loss)		(0.6)
Amortization of unrecognized prior service credit	(2.0)	(1.8)	(1.8)
Amortization of unrecognized net transition obligations	(0.2)
Total	$ (1.5)	$ (1.4)	$ (0.7)