EQUITY AND EARNINGS PER SHARE - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions							1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 16, 2021	May 19, 2021	Apr. 16, 2021	Apr. 14, 2021	May 27, 2020	Feb. 14, 2020	Feb. 29, 2020	Aug. 31, 2019	Jul. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Feb. 16, 2021	Dec. 31, 2020	May 19, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)												33,610,000	33,610,000
Preferred stock, par values (in dollars per share)										$ 0.01		$ 0.01			$ 0.01
Liquidation preference per share (in dollars per share)											$ 25.00		$ 25.00
Authorized repurchase amount														$ 200.0
Shares issued, price per share (in dollars per share)				$ 10.10
Options exercised (in shares)			6,725,000			2,100,000						0
Options granted (in shares)												5,172,500
Common stock, par value (in dollars per share)										0.01		$ 0.01			$ 0.01	$ 0.01
Dividends declared on preferred stock (in dollars per share)										$ 1.32	1.32	$ 2.63	$ 2.63
Common stock, shares outstanding (in shares)										466,579,920		466,579,920			414,744,518
Fair value of warrants					$ 53.5
Share price (in dollars per share)										$ 10.59		$ 10.59
Fortress-managed funds
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Common stock, shares outstanding (in shares)										2,400,000		2,400,000
Over-Allotment Option
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)				6,750,000
Shares issued, price per share (in dollars per share)				$ 10.10
Underwritten Public Option
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)				45,000,000		14,000,000
Shares issued, price per share (in dollars per share)				$ 10.10
Distribution Agreement | Common Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)										0
Net proceeds from liquidation		$ 500.0
Share-based Payment Arrangement, Nonemployee
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options granted (in shares)				5,200,000
Share-based Payment Arrangement, Nonemployee | Stock options and common stock purchase warrants
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options granted (in shares)					43,400,000
Exercise price range, lower range limit (in dollars per share)					$ 6.11
Exercise price range, upper range limit (in dollars per share)					$ 7.94
Expected term (in years)					3 years
Risk free interest rate					0.24%
Expected volatility rate					35.00%
Share-based Payment Arrangement, Nonemployee | Stock options and common stock purchase warrants | Exercise Price One
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares exercisable (in shares)																24,600,000
Exercise price (in dollars per share)																$ 6.11
Share-based Payment Arrangement, Nonemployee | Stock options and common stock purchase warrants | Exercise Price Two
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares exercisable (in shares)																18,900,000
Exercise price (in dollars per share)																$ 7.94
6.375% Series C Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)												16,100,000	16,100,000
Interest rate						6.375%	6.375%
Preferred stock, par values (in dollars per share)						$ 0.01
Liquidation preference per share (in dollars per share)						$ 25.00
Net proceeds from liquidation						$ 389.5
Dividends declared on preferred stock (in dollars per share)	$ 0.40									$ 0.40	0.40	$ 0.80	$ 0.80
Preferred dividends	$ 6.4
6.375% Series C Preferred Stock | Over-Allotment Option
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)						1,600,000
6.375% Series C Preferred Stock | Share-based Payment Arrangement, Nonemployee
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Fair value of options granted to Manager						$ 1.0
7.50% Series A Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)												6,210,000	6,210,000
Interest rate									7.50%
Dividends declared on preferred stock (in dollars per share)	$ 0.47									0.47	0.47	$ 0.94	$ 0.94
Preferred dividends	$ 2.9
7.125% Series B Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)												11,300,000	11,300,000
Interest rate								7.125%
Dividends declared on preferred stock (in dollars per share)	$ 0.45									$ 0.45	$ 0.45	$ 0.89	$ 0.89
Preferred dividends	$ 5.0