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Fair Value - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments and Nonfinancial Assets Measured at Fair Value on a Recurring or Non-recurring basis or Disclosed, but not Carried, at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Loans held for sale, at fair value	$ 617.8	$ 917.5	$ 366.4	$ 208.8
Total Loans held for sale	617.8	917.5	366.4
Investment in equity method investee	42.2	23.3
Financial liabilities:
Advance match funded liabilities ($512.5 and $512.3 related to VIEs)	513.7	512.3
Financing liabilities, at fair value:
HMBS-related borrowings	7,326.8	6,885.0	6,772.7	6,063.4
Other financing liabilities	1,137.4	805.0
Secured Debt [Abstract]
Long-term Line of Credit	953.8	900.8
Senior notes:
Senior Notes	599.6	614.8
Mortgage Service Rights
MSRs	2,665.2	2,250.1	$ 1,294.8	$ 1,486.4
Financing Liability Excess Servicing Spread
Financing liabilities, at fair value:
Other financing liabilities	199.0	0.0
Carrying Value
Financial assets:
Total Loans held for sale	622.7	928.5
Loans held for investment	7,510.8	7,207.7
Financing liabilities, at fair value:
Total Other financing liabilities	1,137.4	805.0
Senior notes:
Senior Notes	599.6	614.8
Fair Value
Financial assets:
Total Loans held for sale	622.7	928.5
Loans held for investment	7,510.8	7,207.7
Financing liabilities, at fair value:
Total Other financing liabilities	1,137.4	805.0
Senior notes:
Senior Notes	555.2	674.9
Level 2 | Carrying Value
Financial assets:
Loans held for sale, at fair value	617.8	917.5
Senior notes:
Senior unsecured notes	369.4	392.6
Level 2 | Carrying Value | Option Contracts
Derivative financial instrument assets (liabilities), at fair value
Derivative liabilities	0.0	(0.3)
Level 2 | Fair Value
Financial assets:
Loans held for sale, at fair value	617.8	917.5
Senior notes:
Senior unsecured notes	331.4	413.5
Level 2 | Fair Value | Option Contracts
Derivative financial instrument assets (liabilities), at fair value
Derivative liabilities	0.0	(0.3)
Level 3 | Carrying Value
Financial assets:
Loans held for sale, at lower of cost or fair value	4.9	11.0
Loans held for investment	7,504.1	7,199.8
Advances (including match funded)	718.9	772.4
Receivables, net	180.8	180.7
Financial liabilities:
Advance match funded liabilities ($512.5 and $512.3 related to VIEs)	513.7	512.3
Financing liabilities, at fair value:
HMBS-related borrowings	7,326.8	6,885.0
Secured Debt [Abstract]
Long-term Line of Credit	953.8	900.8
Other	702.7	1,085.1
Senior notes:
Senior secured notes	230.2	222.2
Derivative financial instrument assets (liabilities), at fair value
Interest rate lock commitments	(0.7)	(18.1)
Mortgage Service Rights
MSRs	2,665.2	2,250.1
Level 3 | Carrying Value | Derivative [Member]
Derivative financial instrument assets (liabilities), at fair value
Derivative liabilities	(0.1)	(1.1)
Level 3 | Carrying Value | Loans Held for Investments - Restricted for Securitization Investors
Financial assets:
Loans held for investment	6.7	7.9
Level 3 | Carrying Value | Financing Liability - MSRs Pledged
Financing liabilities, at fair value:
Other financing liabilities	931.7	797.1
Level 3 | Carrying Value | Financing Liability Owed to Securitization Investors
Financing liabilities, at fair value:
Other financing liabilities	6.7	7.9
Level 3 | Carrying Value | Financing Liability Excess Servicing Spread
Financing liabilities, at fair value:
Other financing liabilities	199.0	0.0
Level 3 | Fair Value
Financial assets:
Loans held for sale, at lower of cost or fair value	4.9	11.0
Loans held for investment	7,504.1	7,199.8
Advances (including match funded)	718.9	772.4
Receivables, net	180.8	180.7
Financial liabilities:
Advance match funded liabilities ($512.5 and $512.3 related to VIEs)	513.7	512.0
Financing liabilities, at fair value:
HMBS-related borrowings	7,326.8	6,885.0
Secured Debt [Abstract]
Long-term Line of Credit	932.1	873.8
Other	702.7	1,085.1
Senior notes:
Senior secured notes	223.9	261.5
Derivative financial instrument assets (liabilities), at fair value
Interest rate lock commitments	(0.7)	(18.1)
Mortgage Service Rights
MSRs	2,665.2	2,250.1
Level 3 | Fair Value | Derivative [Member]
Derivative financial instrument assets (liabilities), at fair value
Derivative liabilities	(0.1)	(1.1)
Level 3 | Fair Value | Loans Held for Investments - Restricted for Securitization Investors
Financial assets:
Loans held for investment	6.7	7.9
Level 3 | Fair Value | Financing Liability - MSRs Pledged
Financing liabilities, at fair value:
Other financing liabilities	931.7	797.1
Level 3 | Fair Value | Financing Liability Owed to Securitization Investors
Financing liabilities, at fair value:
Other financing liabilities	6.7	7.9
Level 3 | Fair Value | Financing Liability Excess Servicing Spread
Financing liabilities, at fair value:
Other financing liabilities	199.0	0.0
Level 1 | Carrying Value | Forward LHFS Trades
Derivative financial instrument assets (liabilities), at fair value
Derivative Asset	0.5
Derivative liabilities		0.4
Level 1 | Carrying Value | TBA/Forward Mortgage Backed Securities Trades
Derivative financial instrument assets (liabilities), at fair value
Derivative liabilities	(0.7)	(0.3)
Level 1 | Carrying Value | Interest Rate Swap
Derivative financial instrument assets (liabilities), at fair value
Derivative Asset	(13.6)	1.7
Level 1 | Carrying Value | TBA Forward Pipelines Trades
Derivative financial instrument assets (liabilities), at fair value
Derivative Asset	6.6	0.0
Level 1 | Fair Value | Forward LHFS Trades
Derivative financial instrument assets (liabilities), at fair value
Derivative Asset	0.5
Derivative liabilities		0.4
Level 1 | Fair Value | TBA/Forward Mortgage Backed Securities Trades
Derivative financial instrument assets (liabilities), at fair value
Derivative liabilities	(0.7)	(0.3)
Level 1 | Fair Value | Interest Rate Swap
Derivative financial instrument assets (liabilities), at fair value
Derivative Asset	(13.6)	1.7
Level 1 | Fair Value | TBA Forward Pipelines Trades
Derivative financial instrument assets (liabilities), at fair value
Derivative Asset	$ 6.6	$ 0.0

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents advances and match funded advances.

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Financing Liabilities [Abstract]

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This represents the amount of liability which is a resultant of reverse mortgage loans sold into the secondary with servicing rights retained. As the transfer of these loans do not meet the definition of participating interest because of the servicing requirement that requires the issuer to absorb some level of risk, these transfers are accounted for as financing.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale at lower cost of fair value as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date.

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This element represents the home equity conversion mortgages insured by FHA.

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Mortgage Service Rights [Abstract]

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Other financing liabilities.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of mortgage loans held-for-sale.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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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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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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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.

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