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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
	Dec. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		$ 2,374.7	$ 2,580.6	$ 2,272.2	$ 2,665.2
Servicing Asset at Fair Value, Disposals		(100.9)	0.0	(100.9)	0.0
Recognized on the sale of residential mortgage loans		67.7	31.5	102.4	62.6
Purchases of MSRs		34.9	19.1	61.8	44.0
Servicing transfers and adjustments		(85.7)	(32.5)	(87.0)	(32.5)
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions		92.6	136.8	194.4	53.2
Realization of cash flows		(55.4)	(59.7)	(115.2)	(116.8)
Ending balance	$ 2,272.2	2,327.7		2,327.7
Assets serviced	169,700.0	162,900.0		162,900.0
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)
Derivative, Gain (Loss) on Derivative, Net		46.7	47.4	96.0	44.0
MSR valuation adjustments, net		32.7	48.9	44.3	117.9
Total MSR Reserve Fair Value Gains (Losses)		37.2	77.2	79.2	(63.3)
ESS Financing Liability
Changes in fair value recognized in earnings:
Realization of expected cash flows		10.4	15.6	22.9	30.1
Derivative, Gain (Loss) on Derivative, Net		(50.6)	(65.2)	(104.3)	(51.1)
MSR Asset Vehicle LLC
Changes in fair value recognized in earnings:
UPB of MSRs sold				30.1	17.9
Fair Value Agency Mortgage Servicing Rights
Changes in fair value recognized in earnings:
Ending balance			2,675.7		2,675.7
Servicing Asset at Fair Value, Period Increase (Decrease)			77.1		(63.6)
Servicing assets at fair value, net additions (sales) recognized			18.1		$ 74.1
Fair Value Agency Mortgage Servicing Rights | MAV Asset Vehicle LLC
Changes in fair value recognized in earnings:
UPB of MSRs sold		5,500.0	2,300.0
Fair Value Non-Agency Mortgage Servicing Rights
Changes in fair value recognized in earnings:
Assets serviced	23,800.0	22,400.0		22,400.0
Rithm Capital Corp . and others
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance				244.8
Changes in fair value recognized in earnings:
Ending balance	244.8	264.0		264.0
Assets serviced	18,100.0	18,600.0		18,600.0
Transferred MSR, Subject To Pledged Liability
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance				667.6
Changes in fair value recognized in earnings:
Ending balance	667.6	607.6		607.6
Assets serviced	46,900.0	40,900.0		40,900.0
Fair Value GSE Mortgage Servicing Rights
Changes in fair value recognized in earnings:
Assets serviced	$ 127,300.0	122,900.0		$ 122,900.0
Fair Value GSE Mortgage Servicing Rights | MAV Asset Vehicle LLC
Changes in fair value recognized in earnings:
Servicing Asset At Fair Value, Amount Derecognized		$ 85.8	$ 32.5

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Total of property assets serviced as measured by UPB.

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

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