Share-Based Compensation Plans (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Option [Member]
Weighted-average assumptions used for options granted
Expected dividends	2.10%	2.20%	2.20%
Expected volatility	35.10%	40.70%	38.70%
Risk-free interest rate	0.70%	0.60%	1.70%
Expected term in years	4 years 3 months 17 days	3 years 8 months 12 days	3 years 7 months 6 days
Grant-date fair value	$ 13.97	$ 14.07	$ 12.88
Employee Stock Purchase Plan [Member]
Weighted-average assumptions used for options granted
Expected dividends	2.20%	2.70%	2.40%
Expected volatility	28.00%	32.70%	32.80%
Risk-free interest rate	0.10%	0.10%	0.10%
Expected term in years	3 months	3 months	3 months
Grant-date fair value	$ 11.73	$ 9.53	$ 10.21