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Capital Stock - ATM Agreements (Details) - USD ($) $ in Millions |  |  |  |  |  | 8 Months Ended | 39 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 05, 2021 | Apr. 09, 2021 | Mar. 10, 2021 | Dec. 15, 2020 | Dec. 18, 2018 | Mar. 31, 2022 | Mar. 31, 2022
8.625% Series A Cumulative, Perpetual Preferred Stock |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 984,000 |  |  |
Series B Depositary Shares |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |
Shares issued (in shares) |  | 1,600,000 |  |  |  |  |
2018 Common Stock ATM Agreement |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |
Maximum amount of common shares to be issued |  |  |  |  | $ 30.0 |  |
Shares issued (in shares) |  |  |  |  |  |  | 0
Maximum amount of shares to be issued |  |  | $ 50.0 |  |  |  |
2018 Common Stock ATM Agreement | Maximum |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |
Sales commission paid per transaction (as a percent) |  |  |  |  | 3.00% |  |
2021 ATM Agreement |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |
Maximum amount of common shares to be issued | $ 50.0 |  |  |  |  |  |
2021 ATM Agreement | Series B Depositary Shares |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  | 0 |
2021 ATM Agreement | Maximum |  |  |  |  |  |  |
Sale of stock |  |  |  |  |  |  |
Sales commission paid per transaction, preferred stock (as a percent) | 3.00% |  |  |  |  |  |

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