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Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	$ 2,762.9	$ 2,632.6	$ 2,466.3	$ 2,327.7	$ 2,272.2
Assets serviced	189,800.0		170,300.0
UPB of loans transferred	60,816.8		49,641.2
Owned MSRs
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	2,186.3		1,869.6
Assets serviced	150,900.0		129,800.0
MAV Transferred MSRs
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	315.3		330.6
Assets serviced	20,300.0		21,500.0
Financing Liability Excess Servicing Spread [Member]
Servicing Assets at Fair Value [Line Items]
MSRs, at fair value	$ 333.1		$ 338.7

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- Definition

Total of property assets serviced as measured by UPB.

+ References

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- Definition

Unpaid principal balance of forward loans transferred with servicing rights retained.

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- Definition

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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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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