Equity (Weighted Average Assumptions Used to Determine Fair Value of Stock Options) (Details) - Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity - Stock-based Compensation Plans [Line Items]
Dividend yield	3.70%	3.76%	3.52%
Risk-free rate of return, Minimum	1.30%	2.52%	2.02%
Risk-free rate of return, Maximum	1.57%	3.32%	3.40%
Expected volatility	25.55%	30.27%	34.18%
Exercise multiple	1.44	1.43	1.43
Post-vesting termination rate	3.79%	3.86%	3.77%
Contractual term (years)	10 years	10 years	10 years
Expected life (years)	7 years	6 years	6 years
Weighted average exercise price of stock options granted	$ 47.58	$ 44.65	$ 45.50
Weighted average fair value of stock options granted	$ 9.02	$ 10.36	$ 11.87