Share-Based Compensation Plans (Schedule of Weighted-Average Assumptions for Stock Options) (Details)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Risk-free rate(1)	1.80%	[1]	1.90%	[1]	1.60%	[1]
Expected term(2)	4 years	[2]	4 years	[2]	4 years	[2]
Expected volatility(3)	38.00%	[3]	38.00%	[3]	35.00%	[3]
Expected dividends(4)	3.00%	[4]	3.00%	[4]	4.00%	[4]

[1] The risk-free rate was based upon the rate on a zero coupon U.S. Treasury bill, for periods within the contractual life of the option, in effect at the time of grant.

[2] The expected term of the option or stock appreciation right was based on historical employee exercise behavior, the vesting terms of the respective option or stock appreciation right and a contractual life of ten years.

[3] Expected volatility was based on the weekly historical volatility of our stock price, over a period similar to the expected life of the option.

[4] Assumed the current cash dividends of $.23 during 2011, $.22 during 2010 and $.21 during 2009 per share each quarter on our common stock for options and stock appreciation rights granted during those years.