EQUITY AND REDEEMABLE INTEREST - Preferred Stock (Details) - Series A Preferred Stock - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Dividend rate, percentage		7.00%
Redemption price (in dollars per share)	$ 25.00
Dividends, preferred stock, cash	$ 310.0
Preferred dividends in arrears value	$ 5.4
Preferred stock dividends per share declared (in dollars per share)	$ 0.4375
Fees related to stock issuance	$ 11.2
Preferred Equity
Class of Stock [Line Items]
Partners' capital (in shares)		12,400,000