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