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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+ Details

Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Debt Instrument [Line Items]
Other financing liabilities, at fair value	$ 613.1		$ 613.1		$ 842.0
Servicing and subservicing fees	224.7	$ 217.5	676.4	$ 632.1
Financing Liability Excess Servicing Spread [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	266.3		266.3		268.8
Financing Liability Mortgage Servicing Rights Pledged [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	346.8		346.8		$ 573.2
Original Rights to Mortgage Servicing Rights Agreements \| Financing Liability Mortgage Servicing Rights Pledged [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	$ 38.5		$ 38.5