EARNINGS PER COMMON SHARE AND DIVIDENDS PER SHARE - Dividends Per Share (Details)													1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 01, 2023 $ / shares	Dec. 01, 2023 $ / shares	Oct. 31, 2023 $ / shares	Oct. 31, 2023 $ / shares	Sep. 01, 2023 $ / shares shares	Aug. 31, 2023 $ / shares	Jun. 01, 2023 $ / shares shares	Jun. 01, 2023 $ / shares shares	May 31, 2023 $ / shares	May 31, 2023 $ / shares	Mar. 01, 2023	Feb. 28, 2023 $ / shares	Mar. 31, 2023 $ / shares	Sep. 30, 2023 $ / shares	Sep. 30, 2022 $ / shares	Sep. 30, 2023 $ / shares	Sep. 30, 2022 $ / shares
Dividends Payable [Line Items]
Common stock, dividends per share, paid (dollars per share)														$ 0.89	$ 0.86	$ 2.67	$ 2.58
Common stock dividends increased (in percent)											3.20%
Common shares
Dividends Payable [Line Items]
Common stock, dividends, per share, declared (dollars per share)												$ 0.86	$ 0.8875
Common shares | Forecast
Dividends Payable [Line Items]
Common stock, dividends per share, paid (dollars per share)	$ 0.88750
Common shares | Subsequent event
Dividends Payable [Line Items]
Common stock, dividends, per share, declared (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					2,350,602		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 D2
Dividends Payable [Line Items]
Preferred stock, dividend declared per share (dollars per share)												0.27875	0.33825
Preferred share investment | Preference Shares, Series D2 | Forecast
Dividends Payable [Line Items]
Preferred stock, dividend paid per share (dollars per share)	0.33825
Preferred share investment | Preference Shares, Series D2 | 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
Dividends Payable [Line Items]
Preferred stock, dividend declared per share (dollars per share)					$ 0.47245	$ 0.43858
Preferred share investment | Preference Shares, Series G | Forecast
Dividends Payable [Line Items]
Preferred stock, dividend paid per share (dollars per share)	0.47245
Preferred share investment | Preference Shares, Series G | Subsequent event
Dividends Payable [Line Items]
Preferred stock, dividend declared per share (dollars per share)			0.47245
Preferred share investment | Preference Shares, Series H5
Dividends Payable [Line Items]
Preferred stock, dividend declared per share (dollars per share)					$ 0.38200	$ 0.27350
Preferred share investment | Preference Shares, Series H5 | Forecast
Dividends Payable [Line Items]
Preferred stock, dividend paid per share (dollars per share)	0.38200
Preferred share investment | Preference Shares, Series H5 | Subsequent event
Dividends Payable [Line Items]
Preferred stock, dividend declared per share (dollars per share)			0.38200
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 198
Dividends Payable [Line Items]
Preferred stock, dividend declared per share (dollars per share)												$ 0.30625	$ 0.38825
Preferred share investment | Preference Shares, Series 198 | Forecast
Dividends Payable [Line Items]
Preferred stock, dividend paid per share (dollars per share)	0.38825
Preferred share investment | Preference Shares, Series 198 | Subsequent event
Dividends Payable [Line Items]
Preferred stock, dividend declared per share (dollars per share)			0.38825
Preferred share investment | Series I Preferred Stock | Forecast
Dividends Payable [Line Items]
Preferred stock, dividend declared per share (dollars per share)	$ 0.44814
Preferred share investment | Series I Preferred Stock | Subsequent event
Dividends Payable [Line Items]
Preferred stock, dividend paid per share (dollars per share)			$ 0.44814