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EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE - Dividends Per Share (Details) |  |  |  |  | 2 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 03, 2020 $ / shares | Nov. 03, 2020 $ / shares | Sep. 01, 2020 $ / shares | Jun. 01, 2020 $ / shares | Mar. 01, 2020 $ / shares | Feb. 29, 2020 $ / shares | Aug. 31, 2020 $ / shares | May 31, 2020 $ / shares
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) |  |  |  |  | $ 0.81 | $ 0.738 |  |
Increase in quarterly dividend per common share (percent) |  |  |  |  | 9.80% |  |  |
Preferred share investment | Preference Shares, Series C |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  | $ 0.15975 | $ 0.16779 | $ 0.25458 | 0.25305 | $ 0.16779 | $ 0.25458
Preferred share investment | Preference Shares, Series 11 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  | $ 0.24613 | $ 0.275 |  |
Preferred share investment | Preference Shares, Series 13 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  | $ 0.19019 |  |  |  | $ 0.275
Preferred share investment | Preference Shares, Series 15 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  | $ 0.18644 |  |  |  | $ 0.275 |
Subsequent event | Common shares |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) | $ 0.81000 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series A |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.34375 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series B |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.21340 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series C |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.15975 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series D |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.27875 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series F |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.29306 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series H |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.27350 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series J |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | $ 0.30540 |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series L |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | 0.30993 |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series N |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.31788 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series P |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.27369 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series R |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.25456 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 1 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | 0.37182 |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 3 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.23356 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 5 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | $ 0.33596 |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 7 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.27806 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 9 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.25606 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 11 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.24613 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 13 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.19019 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 15 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.18644 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 17 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | 0.32188 |  |  |  |  |  |  |
Subsequent event | Preferred share investment | Preference Shares, Series 19 |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | $ 0.30625 |  |  |  |  |  |  |

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