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Shareholders' Equity (Summary of Dividends) (Details) - $ / shares		3 Months Ended		12 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Dividends
Divdends declared per common share		$ 1.100	$ 1.090
Dividends paid per common share		$ 1.100	$ 1.090
5.417% Series 1 Cumulative Convertible Preferred shares
Dividends
Preferred shares, percentage		5.417%	5.417%	5.417%
Dividends declared per preferred share		$ 0.339	$ 0.339
Dividends paid per preferred share		$ 0.339	$ 0.339
5.0% Series C Cumulative Redeemable Preferred shares
Dividends
Preferred shares, percentage		5.00%	5.00%	5.00%
Dividends declared per preferred share	[1]	$ 0.313	$ 0.313
Dividends paid per preferred share	[1]	$ 0.313	$ 0.313
[1] Amount represents dividends per depository share, each representing 1/1000th of a share.

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