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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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