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Securitizations and Variable Interest Entities - Schedule Of Carrying Value and Classification of Assets and Liabilities of Advance Financing Facilities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Debt service accounts	$ 27.0		$ 71.2
Advance match funded liabilities	405.0	$ 499.7
Variable Interest Entity, Primary Beneficiary
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Advance match funded liabilities	404.3	498.9
Variable Interest Entity, Primary Beneficiary | Advance match funded liabilities
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Match funded advances (Advances, net)	467.9	573.0
Debt service accounts	10.6	15.7
Advance match funded liabilities	$ 404.3	$ 498.9

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Debt Service Accounts

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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-Section 50
-Paragraph 1A
-Subparagraph (b)(1)
-SubTopic 30
-Topic 860
-Publisher FASB
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- Definition

Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
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-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(ii)
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