EQUITY AND EARNINGS PER SHARE - Narrative (Details) - USD ($)													1 Months Ended				3 Months Ended	12 Months Ended
	Jan. 01, 2022	Dec. 15, 2021	Sep. 22, 2021	Sep. 14, 2021	May 19, 2021	Apr. 16, 2021	Apr. 14, 2021	Jan. 01, 2021	May 19, 2020	Feb. 14, 2020	Jan. 01, 2020	Jan. 01, 2014	Sep. 30, 2021	Feb. 29, 2020	Aug. 31, 2019	Jul. 31, 2019	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 02, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Common stock, shares authorized (in shares)																		2,000,000,000	2,000,000,000
Common stock, par value (in dollars per share)									$ 0.01									$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)																		100,000,000	100,000,000
Preferred stock, par values (in dollars per share)																		$ 0.01	$ 0.01
Number of common shares (in shares)																		52,210,000	33,610,000
Preferred stock, liquidation preference per share (in dollars per share)																		$ 25.00
Option exercise (in shares)			1,600,000			6,725,000				2,100,000								0	0
Share price (in dollars per share)				$ 10.89			$ 10.10
Granted (in shares)																		7,051,335	1,619,739
Preferred stock, dividends (in dollars per share)																		$ 5.97	$ 5.26	$ 2.05
Common stock, shares outstanding (in shares)																		466,758,266	414,744,518
Fair value																	$ 53,500,000
Reserved shares of common stock for issuance (in shares)																		15,000,000
Stock option plan term (in years)																		10 years
Yearly increase in number of shares available for options																		10.00%
Number of additional shares authorized (in shares)								9,739			4,600,000	0
Threshold percentage for options that may be issued to the Manager																		10.00%
Stock options outstanding (in shares)																		21,478,990
Share price (in dollars per share)																		$ 10.71
Subsequent Event
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of additional shares authorized (in shares)	5,190,335
Fortress-managed funds
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Common stock, shares outstanding (in shares)																		2,400,000
Stock options outstanding (in shares)																		19,900,000
Common Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Option exercise (in shares)																				348,613
Stock repurchase program, authorized amount																		$ 200,000,000
Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Stock repurchase program, authorized amount																		$ 100,000,000
Share-based Payment Arrangement, Nonemployee
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Granted (in shares)				1,900,000			5,200,000
Share-based Payment Arrangement, Nonemployee | Warrant
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Granted (in shares)									43,400,000								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 | Warrant | 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 | Warrant | 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
Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Stock repurchase program, authorized amount																					$ 100,000,000
Share repurchases (in shares)																		0
7.50% Series A Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of common shares (in shares)																		6,210,000	6,210,000
Dividend interest rate																7.50%
Preferred stock, dividends (in dollars per share)		$ 0.47																$ 1.88	$ 1.88	$ 1.16
Dividends on preferred stock		$ 2,900,000
7.125% Series B Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of common shares (in shares)																		11,300,000	11,300,000
Dividend interest rate															7.125%
Preferred stock, dividends (in dollars per share)		$ 0.45																$ 1.78	$ 1.78	0.89
Dividends on preferred stock		$ 5,000,000
6.375% Series C Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Preferred stock, par values (in dollars per share)										$ 0.01
Number of common shares (in shares)																		16,100,000	16,100,000
Dividend interest rate										6.375%				6.375%
Preferred stock, liquidation preference per share (in dollars per share)										$ 25.00
Sale of stock, consideration received on transaction										$ 389,500,000
Preferred stock, dividends (in dollars per share)		$ 0.40																$ 1.59	$ 1.60	0
Dividends on preferred stock		$ 6,400,000
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										$ 1,000,000
Common Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share repurchases (in shares)																			1,000,000
Stock repurchased, average cost per share (in dollars per share)																			$ 7.46
7.00% Series D Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Preferred stock, par values (in dollars per share)				$ 0.01
Number of common shares (in shares)																		18,600,000	0
Dividend interest rate				7.00%									7.00%
Preferred stock, liquidation preference per share (in dollars per share)				$ 25.00
Sale of stock, consideration received on transaction				$ 449,500,000
Preferred stock, dividends (in dollars per share)		$ 0.44																$ 0.72	$ 0	$ 0
Dividends on preferred stock		$ 8,100,000
Underwritten Public Option
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of common shares (in shares)							45,000,000			14,000,000
Share price (in dollars per share)							$ 10.10
Underwritten Public Option | 7.00% Series D Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of common shares (in shares)				17,000,000
Over-Allotment Option
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of common shares (in shares)				2,550,000			6,750,000
Share price (in dollars per share)				$ 24.2125			$ 10.10
Over-Allotment Option | 6.375% Series C Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of common shares (in shares)										1,600,000
Distribution Agreement | Common Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of common shares (in shares)																		178,000
Sale of stock, consideration received on transaction					$ 500,000,000
Average price per share (in dollars per share)																		$ 11.51