CAPITAL STOCK - Schedule of Preferred Stock (Details) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended
	Dec. 31, 2024		Sep. 30, 2025	Sep. 30, 2025
Class of Stock [Line Items]
Shares Authorized (in shares)	63,500,000		75,000,000	75,000,000
Shares Issued (in shares)	63,500,000		74,500,000	74,500,000
Shares Outstanding (in shares)	63,500,000		74,500,000	74,500,000
Carrying Value	$ 1,536,569	[1]	$ 1,802,480	$ 1,802,480
Series J
Class of Stock [Line Items]
Shares Authorized (in shares)	0		11,500,000	11,500,000
Shares Issued (in shares)	0		11,000,000	11,000,000
Shares Outstanding (in shares)	0		11,000,000	11,000,000
Carrying Value	$ 0		$ 265,911	$ 265,911
Contractual Rate			8.875%	8.875%
Series F
Class of Stock [Line Items]
Shares Authorized (in shares)	28,800,000		28,800,000	28,800,000
Shares Issued (in shares)	28,800,000		28,800,000	28,800,000
Shares Outstanding (in shares)	28,800,000		28,800,000	28,800,000
Carrying Value	$ 696,910		$ 696,910	$ 696,910
Contractual Rate	6.95%			6.95%
Floating Annual Rate				4.993%
Series G
Class of Stock [Line Items]
Shares Authorized (in shares)	17,000,000		17,000,000	17,000,000
Shares Issued (in shares)	17,000,000		17,000,000	17,000,000
Shares Outstanding (in shares)	17,000,000		17,000,000	17,000,000
Carrying Value	$ 411,335		$ 411,335	$ 411,335
Contractual Rate	6.50%			6.50%
Floating Annual Rate				4.172%
Series I
Class of Stock [Line Items]
Shares Authorized (in shares)	17,700,000		17,700,000	17,700,000
Shares Issued (in shares)	17,700,000		17,700,000	17,700,000
Shares Outstanding (in shares)	17,700,000		17,700,000	17,700,000
Carrying Value	$ 428,324		$ 428,324	$ 428,324
Contractual Rate	6.75%			6.75%
Floating Annual Rate				4.989%
Redeemable Preferred Stock
Class of Stock [Line Items]
Floating Annual Rate				0.26161%

[1] (1)Derived from the audited consolidated financial statements at December 31, 2024.