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Common Stock (Schedule Of Weighted-Average Assumptions Fair Value Of Option Grants) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Common Stock [Abstract]
Volatility	$ 29.00%	$ 27.00%	$ 28.00%
Interest rate	$ 2.00%	$ 3.00%	$ 3.00%
Expected life (years)	$ 3.5	$ 3.6	$ 3.6
Forfeiture rate	$ 9.00%	$ 10.00%	$ 10.00%
Dividend yield	$ 0.70%	$ 0.70%	$ 0.70%

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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