Equity (Schedule of Dividends Declared) (Details) - $ / shares	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Common Stock, Dividends, Per Share, Declared	$ 0.90	$ 1.1025	$ 2.0025	$ 2.2050	$ 2.9025	$ 3.3075
Declared December 15, 2020
Common Stock, Dividends, Per Share, Declared					1.1025
Declared March 12, 2021
Common Stock, Dividends, Per Share, Declared					1.1025
Declared June 3, 2021
Common Stock, Dividends, Per Share, Declared					0.90
Declared November 7, 2019
Common Stock, Dividends, Per Share, Declared					1.05
Declared February 19, 2020
Common Stock, Dividends, Per Share, Declared					1.1025
Declared June 15, 2020
Common Stock, Dividends, Per Share, Declared					1.1025
Declared August 6, 2021
Common Stock, Dividends, Per Share, Declared					0.90
Declared September 14, 2020
Common Stock, Dividends, Per Share, Declared					$ 1.1025