Share-Based Compensation Plans (Schedule of Weighted-Average Assumptions for Stock Options) (Details)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Risk-free rate(1)	0.70%	[1]	1.80%	[1]	1.90%	[1]
Expected term(2)	4 years	[2]	4 years	[2]	4 years	[2]
Expected volatility(3)	38.00%	[3]	38.00%	[3]	38.00%	[3]
Expected dividends(4)	5.00%	[4]	3.00%	[4]	3.00%	[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 was based on historical employee exercise behavior, the vesting terms of the respective option and a contractual life of 10 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 then-current cash dividends of $.23 during 2012, $.23 during 2011 and $.22 during 2010 per share each quarter on our common stock for options granted during those years.