Stock-Based Compensation (Schedule Of Grant Date Fair Value Calculated Using Black-Scholes Option-Pricing Model) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Stock-Based Compensation [Abstract]
Exercise price	$ 42.34	$ 41.43
Expected dividend yield	3.42%	3.48%
Expected stock price volatility	49.40%	50.58%
Risk-free interest rate	2.39%	2.75%
Expected life (years)	6.5	6.5

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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