Summary of Under-Funded or Non-Funded Pension Benefit Plans with Projected Benefit Obligation in Excess of Plan Assets (Detail) (Non Funded Pension Benefit Plans, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Non Funded Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 368.6	$ 408.6
Fair value of plan assets	$ 284.4	$ 276.3

Summary of Under-Funded or Non-Funded Pension Benefit Plans with Projected Benefit Obligation in Excess of Plan Assets (Detail) (Non Funded Pension Benefit Plans, USD $)
In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Non Funded Pension Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Projected benefit obligation

$ 368.6

$ 408.6

Fair value of plan assets

$ 284.4

$ 276.3