Shareholders' Equity (Summary of Dividends) (Details) - $ / shares		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Dividends
Divdends declared per common share		$ 1.09	$ 1.08	$ 2.18	$ 2.16
Dividends paid per common share				$ 2.180	$ 2.160
5.417% Series 1 Cumulative Convertible Preferred shares
Dividends
Preferred shares, percentage		5.417%	5.417%	5.417%	5.417%	5.417%
Dividends declared per preferred share				$ 0.677	$ 0.677
Dividends paid per preferred share				$ 0.677	$ 0.677
5.0% Series C Cumulative Redeemable Preferred shares
Dividends
Preferred shares, percentage				5.00%	5.00%	5.00%
Dividends declared per preferred share	[1]			$ 0.625	$ 0.625
Dividends paid per preferred share	[1]			$ 0.625	$ 0.625

[1] Amount represents dividends per depository share, each representing 1/1000th of a share.