Condensed Consolidated Statement of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Dividends on common stock per share	$ 0.32	$ 0.28
7% Series A Preferred Stock
Preferred stock, dividend rate (as a percent)	7.00%		7.00%
7% Series A Preferred Stock | Preferred stock
Preferred stock, dividend rate (as a percent)	7.00%	7.00%
Dividends on preferred stock per share	$ 1.75	$ 1.75
6% Series B Preferred Stock
Preferred stock, dividend rate (as a percent)	6.00%		6.00%
6% Series B Preferred Stock | Preferred stock
Preferred stock, dividend rate (as a percent)	6.00%	6.00%
Dividends on preferred stock per share	$ 60.00	$ 60.00
6% Series C Preferred Stock
Preferred stock, dividend rate (as a percent)	6.00%		6.00%
6% Series C Preferred Stock | Preferred stock
Preferred stock, dividend rate (as a percent)	6.00%	6.00%
Dividends on preferred stock per share	$ 60.00	$ 60.00
8.25% Series D Preferred Stock
Preferred stock, dividend rate (as a percent)	8.25%		8.25%
8.25% Series D Preferred Stock | Preferred stock
Preferred stock, dividend rate (as a percent)	8.25%	8.25%
Dividends on preferred stock per share	$ 82.50