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EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE - Dividends Per Share (Details) |  |  |  |  | 2 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 03, 2021 $ / shares | Nov. 03, 2021 $ / shares | Sep. 01, 2021 $ / shares | Jun. 01, 2021 $ / shares | Mar. 01, 2021 $ / shares | Feb. 28, 2021 $ / shares | Aug. 31, 2021 $ / shares | May 31, 2021 $ / shares
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) |  |  |  |  | $ 0.835 | $ 0.81 |  |
Increase in quarterly dividend per common share (percent) |  |  |  |  | 3.00% |  |  |
Common shares | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) | $ 0.83500 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series A | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.34375 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series B | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.21340 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series C |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  | $ 0.16081 | $ 0.15753 | $ 0.15501 | $ 0.15349 | $ 0.15753 | $ 0.15501
Preferred share investment | Preference Shares, Series C | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.16081 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series D | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.27875 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series F | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.29306 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series H | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.27350 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series J | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | $ 0.30540 |  |  |  |  |  |
Preferred share investment | Preference Shares, Series L | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | 0.30993 |  |  |  |  |  |
Preferred share investment | Preference Shares, Series N | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.31788 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series P | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.27369 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series R | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.25456 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 1 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | 0.37182 |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 3 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.23356 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 5 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | $ 0.33596 |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 7 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.27806 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 9 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.25606 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 11 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.24613 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 13 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.19019 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 15 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.18644 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 17 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.32188 |  |  |  |  |  |  |
Preferred share investment | Preference Shares, Series 19 | Subsequent event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | $ 0.30625 |  |  |  |  |  |  |

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