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Capital Stock (Fair Values Of Options Granted During The Period Estimated Using Weighted-Average Assumptions) (Details)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Capital [Abstract]
Risk-free interest rate	1.25%	1.41%
Volatility factor	35.00%	34.00%
Quarterly dividend yield	0.60%	0.40%
Weighted-average expected life (years)	4 years 0 months 0 days	4 years 1 month 0 days

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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