Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 2,675.7		$ 2,485.7	$ 2,665.2	$ 2,250.1
Sales	0.0		0.0	0.0	149.4
Recognized on the sale of residential mortgage loans	71.4		70.2	134.0	176.2
Purchases	35.7		75.5	79.8	159.1
Servicing transfers and adjustments	0.0		(39.1)	(32.6)	(25.2)
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions	137.7		190.6	190.9	512.4
Realization of expected cash flows	(60.7)		(68.7)	(177.5)	(209.1)
Ending balance	2,859.8	$ 2,675.7	2,714.2	2,859.8	2,714.2
Servicing Asset at Fair Value, Period Increase (Decrease)	77.0		121.9	13.4	303.4
Servicing assets at fair value, net additions (sales) recognized	107.1		106.6	181.2	160.7
Derivative, Gain (Loss) on Derivative, Net	37.3		(6.0)	81.3	12.7
Servicing Asset (Liability) at Fair Value, Other Changes in Fair Value	(35.4)		(44.4)	(107.0)	(127.8)
Servicing Asset (Liability) at Fair Value, Changes in Fair Value Resulting From Changes in Valuation Inputs or Changes in Assumptions	19.1		72.3	(27.2)	213.2
MSR valuation adjustments, net	16.4		(27.9)	134.2	(85.4)
Total MSR Reserve Fair Value Gains (Losses)	(0.0)		2.7	(0.3)	2.8
UPB of MSRs sold				40.7	11,100.0
Owned MSR
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions	137.7		187.9	191.0	509.7
MSR realization of expected cash flows	(60.7)		(68.6)	(177.3)	(209.1)
Total MSR fair value gains (losses)	77.0		119.2	13.7	300.6
ESS Financing Liability
Changes in fair value recognized in earnings:
Servicing Liability at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	(4.6)		(0.7)	(10.2)	(0.7)
Realization of expected cash flows	(7.6)		(0.6)	(22.5)	(0.6)
Total Fair value changes in Servicing liability at fair value	3.1		(0.1)	12.3	(0.1)
ESS Financing Liability
Changes in fair value recognized in earnings:
Servicing Liability at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	(45.5)		(91.1)	(88.3)	(188.3)
Realization of expected cash flows	17.6		23.6	47.8	80.6
Total Fair value changes in Servicing liability at fair value	(27.8)		(67.5)	(40.5)	(107.7)
Derivative, Gain (Loss) on Derivative, Net	(68.6)		(23.8)	(119.7)	(107.5)
MSR Asset Vehicle LLC \| ESS Financing Liability
Changes in fair value recognized in earnings:
Realization of expected cash flows	9.2		6.5	26.2	24.4
Fair Value Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	1,967.4		1,816.6	1,931.8	1,571.8
Sales	0.0		0.0	0.1	149.3
Recognized on the sale of residential mortgage loans	71.4		70.2	134.0	176.2
Purchases	35.7		75.5	79.8	159.1
Servicing transfers and adjustments	0.0		(39.1)	(32.6)	(24.3)
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions	127.9		99.1	189.2	379.5
Realization of expected cash flows	(52.4)		(46.9)	(152.3)	(137.6)
Ending balance	2,149.9	1,967.4	1,975.4	2,149.9	1,975.4
Servicing Asset at Fair Value, Period Increase (Decrease)	75.4		52.2	36.9	241.9
Servicing assets at fair value, net additions (sales) recognized	107.1		106.6	181.2	161.7
Servicing asset at fair value, amount, derecognition		(32.5)	39.0		39.0
UPB of MSRs sold		2,300.0	2,900.0
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	708.4		669.1	733.5	678.3
Sales	0.0		0.0	0.0	0.0
Recognized on the sale of residential mortgage loans	0.0		0.0	0.0	0.0
Purchases	0.0		0.0	0.0	0.0
Servicing transfers and adjustments	0.0		(0.1)	0.0	(0.9)
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions	9.9		91.5	1.7	132.9
Realization of expected cash flows	(8.3)		(21.8)	(25.2)	(71.5)
Ending balance	709.9	$ 708.4	738.8	709.9	738.8
Servicing Asset at Fair Value, Period Increase (Decrease)	1.6		69.8	(23.5)	61.4
Servicing assets at fair value, net additions (sales) recognized	$ 0.0		$ (0.1)	$ 0.0	$ (0.9)

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Total MSR fair value gains (losses)

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The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

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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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