Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative, Notional Amount	$ 3,978.7	$ 937.8
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	21.6	7.7
Derivative Liability, Notional Amount	920.2	1,371.4
Derivative Liability, Fair Value, Gross Liability	(7.0)	(15.7)
Gain (loss) on derivatives, net	(8.2)	(23.5)	$ (13.3)
Forward Sales Of Reverse Loans
Derivative [Line Items]
Derivative, Notional Amount	0.0	20.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.0	0.1
Derivative Liability, Notional Amount	50.0	20.0
Derivative Liability, Fair Value, Gross Liability	(0.1)	(0.1)
Gain (loss) on derivatives, net	$ (0.2)	(0.3)	0.4
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	$ 592.5	0.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	5.1	0.0
Derivative Liability, Notional Amount	0.0	540.1
Derivative Liability, Fair Value, Gross Liability	0.0	1.3
Gain (loss) on derivatives, net	$ 6.4	(17.4)	(6.2)
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	$ 19.1	101.3	1.5
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	$ 790.0	0.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	3.9	0.0
Derivative Liability, Notional Amount	0.0	670.0
Derivative Liability, Fair Value, Gross Liability	0.0	13.6
Option Contracts
Derivative [Line Items]
Derivative, Notional Amount	750.0	0.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	1.9	0.0
TBA/Forward Mortgage Backed Securities Trades Maturing January Through March 2022 And 2023
Derivative [Line Items]
Derivative, Notional Amount	1,818.6	804.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	10.1	6.6
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	854.9	85.0
Derivative Liability, Fair Value, Gross Liability	6.8	0.7
Interest Rate Swap Futures And TBA Forward MBS Trades
Fair value of derivative assets (liabilities) at:
Gain (loss) on derivatives, net	$ (33.1)	(106.9)	(9.5)
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	$ 15.3	56.4
Derivative Liability, Fair Value, Gross Liability	(0.1)	(0.1)
Other
Fair value of derivative assets (liabilities) at:
Gain (loss) on derivatives, net	$ 0.2	1.0	(1.1)
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	(0.3)	0.0
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	$ 5.5	100.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.0	0.4
Gain (loss) on derivatives, net	$ (0.4)	0.4	0.0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on loans held for sale, net
Reverse Loans IRLCs
Derivative [Line Items]
Derivative, Notional Amount	$ 22.1	13.8
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.6	0.6
Gain (loss) on derivatives, net	$ (0.1)	$ (1.4)	$ 1.5
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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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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