Components of Net Periodic Pension and Postretirement Benefit Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits, Domestic
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	3.7	3.3
Expected return on plan assets	(4.4)	(4.2)
Amortization, net	1.2	1.9
Net periodic cost	0.5	1.0
Pension Benefits, Foreign
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.5	0.5
Interest cost	0.6	0.6
Expected return on plan assets	(0.3)	(0.3)
Amortization, net	0.1	0.1
Net periodic cost	0.9	0.9
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.5	0.5
Interest cost	4.3	3.9
Expected return on plan assets	(4.7)	(4.5)
Amortization, net	1.3	2.0
Net periodic cost	1.4	1.9
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	0.1	0.1
Amortization, net	(0.1)	(0.1)
Net periodic cost