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COMMITMENTS, CONTINGENCIES AND REGULATORY MATTERS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Concentration Risk
Sublease income	$ 0.1	$ 0.2		$ 0.2	$ 0.5
Amounts held in escrow and trust accounts	$ 52.5			$ 52.5		$ 27.1
Minimum
Concentration Risk
Lease term	1 year			1 year
Maximum
Concentration Risk
Lease term	6 years			6 years
Onity Financial Corporation | Revenue | Customer Concentration Risk
Concentration Risk
Revenue from largest customer (in percent)	42.00%	43.00%		43.00%	44.00%
Highly Correlated - Onity | Revenue Benchmark | Customer Concentration Risk
Concentration Risk
Revenue from largest customer (in percent)	4.00%			5.00%
Rithm | Revenue | Customer Concentration Risk | Onity Financial Corporation
Concentration Risk
Revenue from largest customer (in percent)			11.00%
Percentage of delinquent loans Onity services (in percent)			0.59
Rithm | Revenue Benchmark | Customer Concentration Risk | Onity Financial Corporation
Concentration Risk
Revenue from largest customer (in percent)			11.00%

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