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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 2,665.2	$ 2,250.1
Sales	0.0	(149.3)
Recognized on the sale of residential mortgage loans	31.1	45.8
Purchases	25.0	46.8
Servicing transfers and adjustments	0.0	(0.8)
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions	(83.6)	203.5
MSR realization of expected cash flows	(57.0)	(72.8)
Total MSR fair value gains (losses)	(140.6)	130.7
Realization of expected cash flows	(57.1)	(72.8)
Ending balance	2,580.6	2,323.3
Servicing Asset at Fair Value, Period Increase (Decrease)	(140.7)	130.7
Servicing assets at fair value, net additions (sales) recognized	56.1	(57.5)
Derivative, Gain (Loss) on Derivative, Net	(3.5)	32.0
MSR valuation adjustments, net	69.0	(35.4)
Total MSR Reserve Fair Value Gains (Losses)	0.1	0.0
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	(2.1)	0.0
Runoff and settlement	(6.8)	0.0
Total Fair value changes in Servicing liability at fair value	4.7	0.0
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	38.3	(56.8)
Runoff and settlement	14.5	28.3
Total Fair value changes in Servicing liability at fair value	52.8	(28.5)
Derivative, Gain (Loss) on Derivative, Net	14.1	(66.8)
MSR Asset Vehicle LLC | 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	2.5	(50.0)
Runoff and settlement	8.6	8.4
Fair Value Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	1,931.8	1,571.8
Sales	0.0	(149.3)
Recognized on the sale of residential mortgage loans	31.1	45.8
Purchases	25.0	46.8
Servicing transfers and adjustments	0.0	0.0
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions	(42.1)	194.5
Realization of expected cash flows	(49.3)	(47.7)
Ending balance	1,896.5	1,661.9
Servicing Asset at Fair Value, Period Increase (Decrease)	(91.4)	146.8
Servicing assets at fair value, net additions (sales) recognized	56.1	(56.7)
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	733.5	678.3
Sales	0.0	0.0
Recognized on the sale of residential mortgage loans	0.0	0.0
Purchases	0.0	0.0
Servicing transfers and adjustments	0.0	(0.8)
Changes in fair value recognized in earnings:
Changes in valuation inputs or assumptions	(41.5)	9.0
Realization of expected cash flows	(7.8)	(25.2)
Ending balance	684.2	661.3
Servicing Asset at Fair Value, Period Increase (Decrease)	(49.3)	(16.2)
Servicing assets at fair value, net additions (sales) recognized	$ 0.0	$ (0.8)

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