SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Loan Delinquencies and Liquidation Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Residential
Variable Interest Entity
Securitized assets	$ 34,000.0		$ 34,000.0		$ 33,000.0
Liquidation losses	1.0	$ 1.3	2.1	$ 1.3
Commercial and other
Variable Interest Entity
Securitized assets	31,500.0		31,500.0		30,100.0
Liquidation losses	0.0	0.0	0.0	0.0
Mortgage securitizations - Non-agency-sponsored
Variable Interest Entity
Securitized assets	65,500.0		65,500.0		63,100.0
Liquidation losses	1.0	$ 1.3	2.1	$ 1.3
Personal loan
Variable Interest Entity
Securitized assets	100.0		100.0
90+ days past due \| Residential
Variable Interest Entity
Securitized assets	300.0		300.0		300.0
90+ days past due \| Commercial and other
Variable Interest Entity
Securitized assets	0.0		0.0		0.0
90+ days past due \| Mortgage securitizations - Non-agency-sponsored
Variable Interest Entity
Securitized assets	$ 300.0		$ 300.0		$ 300.0