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Borrowings - Schedule of Assets Held as Collateral Related to Secured Borrowings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Cash (1)	$ 184.8		$ 201.6
Restricted cash (2)	80.8		53.5
MSRs	2,466.3		2,272.2
Loans held for sale	1,290.2		677.3
Loans held for investment - unsecuritized	11,125.3		7,975.5
Advances, net	577.2		678.8
Receivables, net ($31.9 and $19.9 related to VIEs)	176.4		154.8
REO ($39.4 and $12.5 related to VIEs)	43.9		18.3
Balance	16,435.4		12,513.7	$ 12,399.2
Senior Notes	487.4		595.8
Secured Debt | Ginnie Mae Mortgage Servicing Rights Financing Facility
Debt Instrument [Line Items]
Uncommitted available borrowing capacity	55.3	$ 300.0
Pledged Assets | Secured Debt | Ginnie Mae Mortgage Servicing Rights Financing Facility
Debt Instrument [Line Items]
Proceeds from mortgage loan warehouse facilities, net	46.3
Senior Lien
Debt Instrument [Line Items]
MSRs	1,530.8
Loans held for investment - securitized	10,950.8		7,868.5
Loans held for investment - unsecuritized	174.5		$ 101.5
Advances, net	577.2
Balance	15,944.8
Senior Lien | Pledged Assets
Debt Instrument [Line Items]
Cash (1)	0.0
Restricted cash (2)	40.4
MSRs	1,537.4
Transferred MSRs, Including ESS	935.4
Loans held for sale	1,282.5
Loans held for investment - securitized	10,950.8
Loans held for investment - unsecuritized	98.5
Advances, net	556.1
Receivables, net ($31.9 and $19.9 related to VIEs)	106.9
REO ($39.4 and $12.5 related to VIEs)	40.0
Balance	15,548.0
Senior Lien | Collateralized Borrowings
Debt Instrument [Line Items]
Cash (1)	0.0
Restricted cash (2)	0.0
MSRs	911.7
Transferred MSRs, Including ESS	846.9
Loans held for sale	1,328.5
Loans held for investment - securitized	10,872.1
Loans held for investment - unsecuritized	89.2
Advances, net	463.4
Receivables, net ($31.9 and $19.9 related to VIEs)	98.9
REO ($39.4 and $12.5 related to VIEs)	47.0
Balance	14,657.7
Assets
Debt Instrument [Line Items]
Cash (1)	184.8
Restricted cash (2)	80.8
Transferred MSRs, Including ESS	935.4
Loans held for sale	1,290.2
REO ($39.4 and $12.5 related to VIEs)	43.9
Assets, Available Cash Held By Regulated Subsidiary Guarantors	$ 158.4

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Carrying amount as of the balance sheet date of non-interest-bearing advances made on loans serviced for others. Includes receivables for funds advanced by the servicer to meet contractual principal and interest remittance requirements for the investors, pay property taxes and insurance premiums and process foreclosures. Also includes receivables for funds advanced to maintain, repair and market foreclosed real estate properties on behalf of investors.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

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Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

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Amount due from parties in nontrade transactions, classified as other.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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

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