Earnings per share - Schedule of Preferred Stock Dividends (Details) - $ / shares		3 Months Ended				6 Months Ended		60 Months Ended
	Feb. 22, 2021	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025	Sep. 17, 2024
8.25% Series A Cumulative Redeemable Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dividend percentage	8.25%					8.25%	8.25%
Dividends declared (in dollars per share)		$ 0.51563	$ 0.51563	$ 0.51563	$ 0.51563	$ 1.03126	$ 1.03126
8.00% Series B Cumulative Redeemable Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dividend percentage	8.00%					8.00%	8.00%
Dividends declared (in dollars per share)		0.50	0.50	0.50	0.50	$ 1.00	$ 1.00
8.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dividend percentage	8.00%					8.00%	8.00%	8.00%
Dividends declared (in dollars per share)		$ 0.665952	$ 0.652391	$ 0.704864	$ 0.693062	$ 1.318343	$ 1.397926