Amounts Recognized In Statement Of Financial Position (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Pension and Postretirement Benefits	$ (20.9)	$ (17.6)
Accumulated other comprehensive loss(income)	23.6	17.7
Net amount recognized at end of year	2.7	0.1
Accumulated benefit obligation	96.3	85.4
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Pension and Postretirement Benefits	(30.0)	(27.2)
Accumulated other comprehensive loss(income)	5.1	3.2
Net amount recognized at end of year	(24.9)	(24.0)
Accumulated benefit obligation	$ 0	$ 0

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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