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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Dec. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		$ 2,327.7	$ 2,675.7	$ 2,272.2	$ 2,665.2
Servicing Asset at Fair Value, Disposals		(108.8)	0.0	(209.7)	0.0
Recognized on the sale of residential mortgage loans		61.6	71.4	163.9	134.0
Purchases of MSRs		53.4	35.7	115.3	79.8
Servicing transfers and adjustments		(0.1)	0.0	(87.1)	(32.6)
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions		(53.0)	137.7	141.4	190.9
Realization of cash flows		(57.3)	(60.7)	(172.5)	(177.5)
Ending balance	$ 2,272.2	2,223.6		2,223.6
Assets serviced	169,700.0	159,500.0		159,500.0
Servicing Asset at Fair Value, Period Increase (Decrease)		(110.3)		(31.1)
Servicing assets at fair value, net additions (sales) recognized		6.1		(17.6)
Derivative, Gain (Loss) on Derivative, Net		(19.4)	37.3	76.7	81.3
MSR valuation adjustments, net		31.5	16.4	75.8	134.2
Total MSR Reserve Fair Value Gains (Losses)		(110.3)	77.0	(31.1)	13.7
ESS Financing Liability
Changes in fair value recognized in earnings:
Realization of expected cash flows		10.2	17.6	33.1	47.8
Derivative, Gain (Loss) on Derivative, Net		54.3	(68.6)	(50.0)	(119.7)
Fair Value Agency Mortgage Servicing Rights
Changes in fair value recognized in earnings:
Ending balance			2,859.8		2,859.8
Servicing Asset at Fair Value, Period Increase (Decrease)			77.0		13.4
Servicing assets at fair value, net additions (sales) recognized			107.1		181.2
Fair Value Agency Mortgage Servicing Rights | MAV Asset Vehicle LLC
Changes in fair value recognized in earnings:
UPB of MSRs sold			2,300.0	5,500.0	$ 2,300.0
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	256.2		256.2
Assets serviced	18,100.0	18,700.0		18,700.0
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	593.6		593.6
Assets serviced	46,900.0	40,600.0		40,600.0
Fair Value GSE Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance				1,773.9
Changes in fair value recognized in earnings:
Ending balance	1,773.9	1,702.1		1,702.1
Assets serviced	127,300.0	118,900.0		118,900.0
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
Fair Value GNMA Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance				277.1
Changes in fair value recognized in earnings:
Ending balance	277.1	307.6		307.6
Assets serviced	18,600.0	18,400.0		18,400.0
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance				221.2
Changes in fair value recognized in earnings:
Ending balance	221.2	213.9		213.9
Assets serviced	$ 23,800.0	$ 22,100.0		$ 22,100.0

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Total of property assets serviced as measured by UPB.

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

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