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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 2,547.4	$ 2,374.7	$ 2,466.3	$ 2,272.2
Sales	0.1		0.3
Sales		(100.9)		(100.9)
Recognized on the sale of residential mortgage loans	82.4	67.7	142.9	102.4
Purchases of MSRs	49.1	34.9	147.4	61.8
Servicing transfers and adjustments	(12.0)	(85.7)	(12.0)	(87.0)
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions	26.8	92.6	7.2	194.4
Realization of cash flows	(61.2)	(55.4)	(119.4)	(115.2)
Ending balance	2,632.6		2,632.6
Assets serviced	181,500.0		181,500.0		$ 170,300.0
Servicing Asset at Fair Value, Period Increase (Decrease)	(34.4)		(112.2)
Servicing assets at fair value, net additions (sales) recognized	119.7		278.6
Derivative, Gain (Loss) on Derivative, Net	3.4	46.7	(5.3)	96.0
MSR valuation adjustments, net	27.3	32.7	66.2	44.3
Total MSR Reserve Fair Value Gains (Losses)	(34.4)	37.2	(112.2)	79.2
Financing Liability Mortgage Servicing Rights Pledged [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Sales	7.5	5.8	14.2	12.7
Changes in fair value recognized in earnings:
Realization of expected cash flows	17.8	17.4	34.8	37.3
Derivative, Gain (Loss) on Derivative, Net	(5.5)	(50.6)	15.3	(104.3)
Fair Value Agency Mortgage Servicing Rights
Changes in fair value recognized in earnings:
Ending balance		2,327.7		2,327.7
Servicing Asset at Fair Value, Period Increase (Decrease)		37.2		79.2
Servicing assets at fair value, net additions (sales) recognized		(84.1)		$ (23.7)
Fair Value Agency Mortgage Servicing Rights | MAV Asset Vehicle LLC
Changes in fair value recognized in earnings:
UPB of MSRs sold		$ 5,500.0
Rithm Capital Corp . and others
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance			266.1
Changes in fair value recognized in earnings:
Ending balance	259.0		259.0
Assets serviced	18,300.0		18,300.0		19,000.0
Transferred MSR, Subject To Pledged Liability
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance			596.7
Changes in fair value recognized in earnings:
Ending balance	580.8		580.8
Assets serviced	39,000.0		39,000.0		40,500.0
Fair Value GSE Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance			1,902.5
Changes in fair value recognized in earnings:
Ending balance	2,031.6		2,031.6
Assets serviced	139,600.0		139,600.0		129,300.0
Fair Value GNMA Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance			351.6
Changes in fair value recognized in earnings:
Ending balance	397.7		397.7
Assets serviced	21,400.0		21,400.0		19,400.0
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance			212.2
Changes in fair value recognized in earnings:
Ending balance	203.4		203.4
Assets serviced	$ 20,500.0		$ 20,500.0		$ 21,600.0

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Total of property assets serviced as measured by UPB.

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Servicing assets at fair value, additions recognized from mortgage sales.

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from sale.

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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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Amount of increase (decrease) in fair value from changes in the inputs used to calculate the fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties.

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