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Securitizations and Variable Interest Entities - Carrying Value and Classification of Assets And Liabilities of PLS Notes Facility (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Servicing Asset	$ 2,223.6	$ 2,272.2
Debt service account (Restricted cash)	35.8		$ 29.7
Unamortized debt issuance costs	(41.1)	(21.0)
Secured Debt
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Unamortized debt issuance costs	(0.3)	(0.4)
Variable Interest Entity, Primary Beneficiary | Secured Debt | Agency and PLS Mortgage Servicing Rights Financing Facility
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Servicing Asset	464.2	449.6
Debt service account (Restricted cash)	1.8	1.7
Short-Term Debt	235.0	282.1
Unamortized debt issuance costs	$ (0.1)	$ (0.4)

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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
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-4

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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481260/860-50-45-2

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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