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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Other financing liabilities, at fair value	$ 822.0		$ 822.0		$ 846.9
Servicing and subservicing fees	217.5	$ 211.1	632.1	$ 626.5
Other counterparties for Pledged MSR liab. | Financing Liabilities
Debt Instrument [Line Items]
Other financing liabilities, at fair value	151.5		151.5		145.8
Financing Liability Excess Servicing Spread [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	255.3		255.3		263.3
Financing Liability Mortgage Servicing Rights Pledged [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	566.7		566.7		583.5
Original Rights to Mortgage Servicing Rights Agreements | Financing Liability Mortgage Servicing Rights Pledged [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	108.1		108.1		115.1
MAV MSR Sale Agreements | Financing Liability Mortgage Servicing Rights Pledged [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	$ 307.1		$ 307.1		$ 322.7

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Other financing liabilities.

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This represents the amount of the fee earned, generally expressed as a percent of UPB, from the borrowers’ payments. Also includes late fees, prepayment penalties, float earnings and other ancillary fees.

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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.

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