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COMMITMENTS, CONTINGENCIES AND REGULATORY MATTERS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Concentration Risk
Sublease income	$ 0.1	$ 0.2
Amounts held in escrow and trust accounts	$ 35.7		$ 24.9
Minimum
Concentration Risk
Lease term (in years)	1 year
Maximum
Concentration Risk
Lease term (in years)	6 years
Onity Financial Corporation | Revenue | Customer Concentration Risk
Concentration Risk
Percentage of revenue from largest customer (in percent)	45.00%	45.00%
Concentration percentage (in percent)	45.00%	45.00%
Highly Correlated - Onity | Revenue Benchmark | Customer Concentration Risk
Concentration Risk
Percentage of revenue from largest customer (in percent)	5.00%
Concentration percentage (in percent)	5.00%
Rithm | Revenue Benchmark | Customer Concentration Risk | Onity Financial Corporation
Concentration Risk
Percentage of revenue from largest customer (in percent)			14.00%
Concentration percentage (in percent)			14.00%
Rithm | Revenue | Customer Concentration Risk | Onity Financial Corporation
Concentration Risk
Percentage of revenue from largest customer (in percent)			14.00%
Concentration percentage (in percent)			14.00%
Percentage of delinquent loans Onity services (in percent)			0.63

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