Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative, Notional Amount	$ 937.8	$ 2,764.8
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	7.7	21.7
Derivative Liability, Notional Amount	1,371.4	1,645.0
Derivative Liability, Fair Value, Gross Liability	(15.7)	(3.1)
Gain (loss) on derivatives, net	(23.5)	(13.3)	$ 35.3
Forward Sales Of Reverse Loans
Derivative [Line Items]
Derivative, Notional Amount	20.0	175.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.1	0.4
Derivative Liability, Notional Amount	20.0	0.0
Derivative Liability, Fair Value, Gross Liability	(0.1)	0.0
Gain (loss) on derivatives, net	$ (0.3)	0.4	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 loans IRLCs
Derivative [Line Items]
Derivative, Notional Amount	$ 0.0	1,022.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.0	16.1
Derivative Liability, Notional Amount	540.1	0.0
Derivative Liability, Fair Value, Gross Liability	1.3	0.0
Gain (loss) on derivatives, net	$ (17.4)	(6.2)	17.5
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	$ 101.3	1.5	0.0
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	$ 0.0	792.5
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.0	1.7
Derivative Liability, Notional Amount	670.0	0.0
Derivative Liability, Fair Value, Gross Liability	13.6	0.0
Gain (loss) on derivatives, net	$ 0.0	0.0	(10.1)
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	125.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.0	0.5
Derivative Liability, Notional Amount	0.0	450.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.8
TBA/Forward Mortgage Backed Securities Trades Maturing January Through March 2022 And 2023
Derivative [Line Items]
Derivative, Notional Amount	804.0	587.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	6.6	0.9
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	85.0	1,195.0
Derivative Liability, Fair Value, Gross Liability	0.7	1.2
Interest Rate Swap Futures And TBA Forward MBS Trades
Fair value of derivative assets (liabilities) at:
Gain (loss) on derivatives, net	$ (106.9)	(9.5)	27.5
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	MSR valuation adjustments, net
Others
Fair value of derivative assets (liabilities) at:
Derivative Liability, Notional Amount	$ 56.4	0.0
Derivative Liability, Fair Value, Gross Liability	(0.1)	(1.1)
Gain (loss) on derivatives, net	$ 0.0	0.0	0.1
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain on loans held for sale, net
Other
Fair value of derivative assets (liabilities) at:
Gain (loss) on derivatives, net	$ 1.0	(1.1)	0.0
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	$ (0.3)	0.0	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	$ 100.0	0.0
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.4	0.0
Gain (loss) on derivatives, net	$ 0.4	0.0	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	$ 13.8	63.3
Fair value of derivative assets (liabilities) at:
Derivatives, at fair value	0.6	2.0
Gain (loss) on derivatives, net	$ (1.4)	$ 1.5	$ 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

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

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Nominal or face amount used to calculate payments on the derivative liability.

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