Retirement Plans (Summary Of Changes In The Fair Value Of Level Three Assets) (Details) (Fair Value, Inputs, Level 3 [Member], Private Equity [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member] \| Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 15.5	$ 6.9
Unrealized losses-net	3.2	(0.3)
Purchases, sales and settlements	11.4	8.9
Fair value of plan assets at end of year	$ 30.1	$ 15.5

The aggregate net gain (loss) recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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