Stock-Based Compensation Plans (Schedule Of Weighted-Average Assumptions Used In Validation Of Stock Options Awards) (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-Based Compensation Plans [Abstract]
Risk-free interest rate	1.90%	2.20%	1.70%
Dividend yield	0.30%	0.50%
Volatility factor	44.00%	43.00%	42.00%
Expected life (in years)	4.3	4.7	4.6

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.

+ References+ Details

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.

+ References+ Details