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EARNINGS PER COMMON SHARE AND DIVIDEND PER SHARE - Dividend Per Share (Details) | 1 Months Ended | 2 Months Ended | 6 Months Ended
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Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Mar. 31, 2019 $ / shares | May 31, 2019 $ / shares | Feb. 28, 2019 $ / shares | Feb. 28, 2019 $ / shares | Jun. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares
Common shares |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) |  |  |  |  |  |  | $ 0.73800 |
Preference Shares, Series A | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.34375 |
Preference Shares, Series B | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.21340 |
Preference Shares, Series C | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | $ 0.25647 | $ 0.25395 |  | $ 0.25395 | $ 0.25459 |  | 0.25647 |
Preference Shares, Series D | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.27875 |
Preference Shares, Series F | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.29306 |
Preference Shares, Series H | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.27350 |
Preference Shares, Series J | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  |  | $ 0.30540
Preference Shares, Series L | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  |  | 0.30993
Preference Shares, Series N | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.31788 |
Preference Shares, Series P | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | 0.27369 |  |  | 0.25000 |  | 0.27369 |
Preference Shares, Series R | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) | $ 0.25456 |  |  | $ 0.25000 |  |  | 0.25456 |
Preference Shares, Series 1 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  |  | 0.37182
Preference Shares, Series 3 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.25000 |
Preference Shares, Series 5 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  | $ 0.33596 |  |  | $ 0.27500 |  | $ 0.33596
Preference Shares, Series 7 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | $ 0.27806 |  |  | $ 0.27500 |  | 0.27806 |
Preference Shares, Series 9 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.27500 |
Preference Shares, Series 11 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.27500 |
Preference Shares, Series 13 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.27500 |
Preference Shares, Series 15 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.27500 |
Preference Shares, Series 17 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | 0.32188 |
Preference Shares, Series 19 | Preferred share investment |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  |  | $ 0.30625 |

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