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Commitments - Schedule of Activity Related to HMBS Repurchases (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Long-term Purchase Commitment [Line Items] |  |
Securitized Home Equity Conversion Mortgage-Backed Security | $ 10,056.7 |
Long-term Purchase Commitment [Roll Forward] |  |
Beginning balance, repurchase securities, amount | 228.0 |
Additions, repurchase securities, amount | 156.9 | $ 41.9
Recoveries, net, repurchase securities, amount | (76.9) |
Transfers, repurchase securities, amount | 0.0 |
Change in value, repurchase securities, amount | (4.0) |
Ending balance, repurchase securities, amount | 304.1 |
Active HECM Loans, UPB Excluded, Directly Assigned | 381.6 |
Maximum Claim Amount, Less Than 92% |  |
Long-term Purchase Commitment [Line Items] |  |
Securitized Home Equity Conversion Mortgage-Backed Security | 8,774.3 |
Maximum Claim Amount, Greater than 92% and Less Than 95% |  |
Long-term Purchase Commitment [Line Items] |  |
Securitized Home Equity Conversion Mortgage-Backed Security | 605.6 |
Maximum Claim Amount, Greater than 95% and less Than 98% |  |
Long-term Purchase Commitment [Line Items] |  |
Securitized Home Equity Conversion Mortgage-Backed Security | 676.8 |
Active (2) |  |
Long-term Purchase Commitment [Roll Forward] |  |
Beginning balance, repurchase securities, amount | 68.5 |
Additions, repurchase securities, amount | 103.0 |
Recoveries, net, repurchase securities, amount | (68.2) |
Transfers, repurchase securities, amount | 4.9 |
Change in value, repurchase securities, amount | 0.2 |
Ending balance, repurchase securities, amount | 108.5 |
Inactive |  |
Long-term Purchase Commitment [Roll Forward] |  |
Beginning balance, repurchase securities, amount | 159.5 |
Additions, repurchase securities, amount | 53.9 |
Recoveries, net, repurchase securities, amount | (8.7) |
Transfers, repurchase securities, amount | (4.9) |
Change in value, repurchase securities, amount | (4.2) |
Ending balance, repurchase securities, amount | $ 195.6 |

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- Definition Active HECM Loans, UPB Excluded, Directly Assigned + References No definition available. + Details
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Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This represents the amount of additions to HMBS repurchase securities. + References No definition available. + Details
Name: | onit_AmountofAdditionsToHomeEquityConversionMortgageBackedSecurityRepurchasesValue
Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This represents the amount of change in value of HMBS repurchase securities. + References No definition available. + Details
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Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This represents the amount of HMBS repurchase securities outstanding. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Long-term Purchase Commitment + References No definition available. + Details
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- Definition This represents the amount of recoveries related to HMBS repurchase securities. + References No definition available. + Details
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- Definition Securitized Home Equity Conversion Mortgage-Backed Security + References No definition available. + Details
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Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This represents the amount of transfers related to HMBS repurchase securities. + References No definition available. + Details
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Namespace Prefix: | onit_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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