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EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE - Dividends Per Share (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended
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Sep. 01, 2023 $ / shares | Sep. 01, 2023 $ / shares | Jul. 31, 2023 $ / shares | Jul. 31, 2023 $ / shares | Jun. 01, 2023 $ / shares shares | Jun. 01, 2023 $ / shares shares | May 31, 2023 $ / shares | May 31, 2023 $ / shares | Jun. 30, 2023 $ / shares | Jun. 30, 2022 $ / shares | Jun. 30, 2023 $ / shares | Jun. 30, 2022 $ / shares
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends per share, paid (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.89 | $ 0.86 | $ 1.78 | $ 1.72
Common shares | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends per share, paid (in dollars per share) | $ 0.88750 |  |  |  |  |  |  |  |  |  |  |
Common shares | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) |  |  | $ 0.88750 |  |  |  |  |  |  |  |  |
Preferred share investment |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Series F preference shares converted into Series G preference shares( in shares) | shares |  |  |  |  | 1,827,695 | 1,827,695 |  |  |  |  |  |
Preferred share investment | Preference Shares, Series A | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.34375 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series A | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.34375 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series B | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.32513 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series B | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.32513 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series D | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.33825 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series D | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.33825 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series F |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  |  |  | $ 0.34613 |  | $ 0.29306 |  |  |  |  |
Preferred share investment | Preference Shares, Series F | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.34613 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series F | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.34613 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series G | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.43858 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series G | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.43858 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series H | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.27350 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series H | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.27350 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series L | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) |  | $ 0.36612 |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series L | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  |  | $ 0.36612 |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series N | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.31788 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series N | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.31788 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series P | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.27369 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series P | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.27369 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series R | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.25456 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series R | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.25456 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 1 |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  |  |  |  | $ 0.41898 |  | $ 0.37182 |  |  |  |
Preferred share investment | Preference Shares, Series 1 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) |  | 0.41898 |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 1 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  |  | 0.41898 |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 3 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.23356 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 3 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.23356 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 5 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) |  | $ 0.33596 |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 5 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  |  | $ 0.33596 |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 7 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.27806 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 7 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.27806 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 9 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.25606 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 9 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.25606 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 11 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.24613 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 11 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.24613 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 13 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.19019 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 13 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.19019 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 15 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | 0.18644 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 15 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | 0.18644 |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 19 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend paid per share (dollars per share) | $ 0.38825 |  |  |  |  |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 19 | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend declared per share (dollars per share) |  |  | $ 0.38825 |  |  |  |  |  |  |  |  |

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