Amounts Recognized In Accumulated Other Comprehensive Loss (Detail) (Pension Plans, Defined Benefit, Accumulated Other Comprehensive Loss, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit | Accumulated Other Comprehensive Loss
Retirement Plans [Line Items]
Net loss	$ 105.8	$ 178.2
Prior service credit	(3.7)	(5.1)
Before tax amount	102.1	173.1
After tax amount	$ 66.7	$ 111.1