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v3.25.1

Other Financing Liabilities, at Fair Value - Schedule of Activity Related to Financing Liability - MSRs Pledged (Details) - Financing Liability Mortgage Servicing Rights Pledged [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Beginning balance | $ 846.9 | $ 894.4
MSR transfers | 6.7 | 7.0
Changes in fair value due to inputs and assumptions | (1.0) | 19.8
Realization of expected cash flows | (17.0) | (19.9)
Total fair value (gain) loss | (18.0) | (0.1)
Ending balance | 835.5 | 901.3
Derecognition of financing liability | 0.0 | 0.0
MSR Asset Vehicle LLC |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
MSR transfers | 0.0 | 0.2
Other MSR Capital Partners |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
MSR transfers | $ 6.7 | $ 6.8

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- Definition Derecognition Of Financing Liability + References No definition available. + Details
Name: | onit_DerecognitionOfFinancingLiability
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This represents the amount of liability arose in connection with sales proceeds received in 2012 and 2013 as part of the Rights to MSRs transactions with NRZ/HLSS and has no contractual maturity or repayment schedule. The balance of the liability is adjusted each reporting period to its fair value based on the present value of the estimated future cash flows underlying the related MSRs. + References No definition available. + Details
Name: | onit_FinancingLiabilityAtFairValue
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This represents the decrease in the value of financing liability due to portfolio runoff, settlements and other. + References No definition available. + Details
Name: | onit_RunoffSettlementsAndOtherFinancingLiability
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Servicing asset at fair value sales. + References No definition available. + Details
Name: | onit_ServicingAssetAtFairValueSales
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Servicing Liability at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions, Net of Adjustments + References No definition available. + Details
Name: | onit_ServicingLiabilityAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsNetOfAdjustments
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Total Fair Value Changes In Servicing Liability At Fair Value, Net Of Adjustments + References No definition available. + Details
Name: | onit_TotalFairValueChangesInServicingLiabilityAtFairValueNetOfAdjustments
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ServicingAssetAtFairValueAmountRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=onit_FinancingLiabilityMortgageServicingRightsPledgedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=onit_MSRAssetVehicleLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=onit_OtherMSRCapitalPartnersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |