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SUBSEQUENT EVENTS (Narrative) (Details) - $ / shares |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 28, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Dividends on common stock (in dollars per share) |  | $ 0.28 | $ 0.28 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.81 | $ 0.75
Dividends on preferred stock (in dollars per share) |  | $ 171.88 | $ 171.88 | $ 171.88 | $ 156.60 |  |  |  |
Common Stock, Class A | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Dividends on common stock (in dollars per share) | $ 0.28 |  |  |  |  |  |  |  |
Common stock dividend increase in amount per share | $ 0.03 |  |  |  |  |  |  |  |
Common stock dividend percentage of increase in amount per share | 12.00% |  |  |  |  |  |  |  |
Dividends payable, date declared | Oct. 28, 2021 |  |  |  |  |  |  |  |
Dividends payable, date to be paid | Nov. 26, 2021 |  |  |  |  |  |  |  |
Dividends payable, date of record | Nov. 12, 2021 |  |  |  |  |  |  |  |
Depositary Shares | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Dividends on preferred stock (in dollars per share) | $ 0.43 |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of preferred stock represented by each depositary share |  |  |  |  |  |  |  | The Series A preferred stock is represented by depositary shares, each representing a 1/400th ownership interest in a share of Series A preferred stock |
Series A Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Dividends on preferred stock (in dollars per share) | $ 171.88 |  |  |  |  |  |  |  |
Dividends payable, date to be paid | Dec. 01, 2021 |  |  |  |  |  |  |  |
Dividends payable, date of record | Nov. 16, 2021 |  |  |  |  |  |  |  |

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