Equity (Weighted Average Assumptions Used to Determine Fair Value of Stock Options) (Details) (Stock Options [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options [Member]
Equity - Stock-based Compensation Plans [Line Items]
Dividend yield	2.13%	1.95%	1.65%
Risk-free rate of return, Minimum	0.16%	0.21%	0.29%
Risk-free rate of return, Maximum	3.89%	4.17%	5.51%
Expected volatility	32.98%	35.59%	32.64%
Exercise multiple	1.51	1.58	1.69
Post-vesting termination rate	3.16%	3.14%	3.36%
Contractual term (years)	10 years	10 years	10 years
Expected life (years)	7 years	7 years	7 years
Weighted average exercise price of stock options granted	$ 35.96	$ 37.91	$ 45.16
Weighted average fair value of stock options granted	$ 9.88	$ 11.33	$ 14.27