Components of Net Periodic Pension and Postretirement Benefit Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Pension Benefits, Domestic
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2.9	$ 3.7
Expected return on plan assets	(4.1)	(4.4)
Amortization, net	1.4	1.2
Net periodic cost	0.2	0.5
Pension Benefits, Foreign
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.6	0.5
Interest cost	0.4	0.6
Expected return on plan assets	(0.3)	(0.3)
Amortization, net	0.3	0.1
Net periodic cost	1.0	0.9
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.6	0.5
Interest cost	3.3	4.3
Expected return on plan assets	(4.4)	(4.7)
Amortization, net	1.7	1.3
Net periodic cost	1.2	1.4
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.1
Amortization, net	$ (0.1)	$ (0.1)