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Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Lower of Cost or Fair Value (Footnote) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Ginnie Mae |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value | $ 12.5 | $ 60.6 | $ 51.8

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- Definition Loans repurchase obligation due to material breach of contractual representations and warranties associated with the agreements pursuant with our transfers of loans. + References No definition available. + Details
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Namespace Prefix: | ocn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=ocn_GinnieMaeLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |