Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative, Notional Amount	$ 1,916.6	$ 3,978.7
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	15.4	21.6
Derivative Liability, Notional Amount	2,975.6	920.2
Derivative Liability, Fair Value, Gross Liability	(27.6)	(7.0)
Gain (loss) on derivatives, net	(82.5)	(8.2)	$ (23.5)
Forward Sales Of Reverse Loans
Derivative [Line Items]
Derivative, Notional Amount	60.0	0.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.4	0.0
Derivative Liability, Notional Amount	0.0	50.0
Derivative Liability, Fair Value, Gross Liability	0.0	(0.1)
Gain (loss) on derivatives, net	$ 0.5	(0.2)	(0.3)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on reverse loans held for investment and HMBS-related borrowings, net
Forward loans IRLCs
Derivative [Line Items]
Derivative, Notional Amount	$ 0.0	592.5
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.0	5.1
Derivative Liability, Notional Amount	1,311.6	0.0
Derivative Liability, Fair Value, Gross Liability	0.7	0.0
Gain (loss) on derivatives, net	$ (5.8)	6.4	(17.4)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on loans held for sale, net
TBA Forward Pipelines Trades
Fair value of derivative assets (liabilities) at:
Gain (loss) on derivatives, net	$ 34.5	19.1	101.3
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on loans held for sale, net
Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount	$ 225.0	790.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	3.2	3.9
Derivative Liability, Notional Amount	875.0	0.0
Derivative Liability, Fair Value, Gross Liability	21.9	0.0
TBA/Forward Mortgage Backed Securities Trades Maturing January Through March 2022 And 2023
Derivative [Line Items]
Derivative, Notional Amount	1,391.1	1,818.6
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	10.0	10.1
TBA/Forward Mortgage Backed Securities Trades Maturing January Through March 2022 And January Through February 2023
Fair value of derivative assets (liabilities) at:
Derivative Liability, Notional Amount	789.0	854.9
Derivative Liability, Fair Value, Gross Liability	5.0	6.8
Interest Rate Swap Futures And TBA Forward MBS Trades
Fair value of derivative assets (liabilities) at:
Gain (loss) on derivatives, net	$ (112.9)	(33.1)	(106.9)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs
Others
Fair value of derivative assets (liabilities) at:
Derivative Liability, Notional Amount	$ 0.0	15.3
Derivative Liability, Fair Value, Gross Liability	0.0	(0.1)
Other
Fair value of derivative assets (liabilities) at:
Gain (loss) on derivatives, net	$ 0.0	0.2	1.0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other revenue, net
TBA Reverse Loan Trades
Fair value of derivative assets (liabilities) at:
Gain (loss) on derivatives, net	$ 0.0	0.0	(0.3)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on reverse loans held for investment and HMBS-related borrowings, net
Forward Trades
Derivative [Line Items]
Derivative, Notional Amount	$ 215.0	5.5
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	1.5	0.0
Gain (loss) on derivatives, net	$ 1.5	(0.4)	0.4
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on loans held for sale, net
Option Contracts
Derivative [Line Items]
Derivative, Notional Amount	$ 0.0	750.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.0	1.9
Reverse Loans IRLCs
Derivative [Line Items]
Derivative, Notional Amount	25.6	22.1
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.2	0.6
Gain (loss) on derivatives, net	$ (0.3)	$ (0.1)	$ (1.4)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on reverse loans held for investment and HMBS-related borrowings, net

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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