Share-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	9 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Sep. 30, 2011
Anticipated purchases under the Management Stock Purchase Program	200,000	200,000
Purchase program fair value per share	$ 38.25	$ 27.42
Black-Sholes model assumption, risk-free interest rate	0.12%	0.22%
Black-Sholes model assumption, expected volatility rate	16.00%	20.00%
Black-Sholes model assumption, dividend yield rate	0.80%	0.90%
Black-Sholes model assumption, expected life of valuations in years	0.6	0.6
Unrecognized compensation expenses related to share-based payment arrangements			$ 70.9
Weighted-average period of recognizing unrecognized compensation expenses related to share-based compensation, in years			3
Plan Of 2003 [Member]
Number of remaining shares that may be issued			4,439,077
Directors' Plan [Member]
Number of remaining shares that may be issued			58,366

Deferred compensation arrangement with individual fair value of shares purchased

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- Definition

The number of shares issued pursuant to the terms of the deferred compensation plan as of the balance sheet date.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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- Definition

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.

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- Definition

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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- Definition

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

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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