Retirement Plans and Other Post-Retirement Benefits - Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract]
Projected benefit obligation	$ 35.4	$ 36.4
Accumulated benefit obligation	31.6	32.0
Fair value of plan assets	$ 601.2	$ 545.7