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Stock Plans (Details 2) (Stock Option [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Option [Member]
Weighted Average Assumptions Used
Dividend yield	1.40%	1.50%	1.60%
Expected volatility	39.00%	41.00%	40.00%
Risk-free interest rate	1.30%	1.30%	2.30%
Expected life of stock option (in years)	6 years 4 months 0 days	6 years 4 months 0 days	6 years 2 months 0 days
Weighted-average fair value per option	$ 21.11	$ 17.48	$ 16.21

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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