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Earnings per share - Summary of preferred stock dividends (Details) - $ / shares	3 Months Ended								12 Months Ended		60 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Sep. 17, 2024
8.25% Series A Cumulative Redeemable Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Preferred stock dividend percentage									8.25%	8.25%
Dividends payable (in dollars per share)	$ 0.51563	$ 0.51563	$ 0.51563	$ 0.51563	$ 0.51563	$ 0.51563	$ 0.51563	$ 0.51563	$ 2.06252	$ 2.06252
8.00% Series B Cumulative Redeemable Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Preferred stock dividend percentage									8.00%	8.00%
Dividends payable (in dollars per share)	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50	$ 2.00	$ 2.00
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]
Preferred stock dividend percentage									8.00%	8.00%	8.00%
Dividends payable (in dollars per share)	$ 0.680181	$ 0.706042	$ 0.704864	$ 0.693062	$ 0.733117	$ 0.50	$ 0.50	$ 0.50	$ 2.784149	$ 2.233117

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+ References

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-Topic 260
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The percentage rate used to calculate dividend payments on preferred stock.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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