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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Derivative [Line Items]
Notional balance	$ 2,428.1		$ 937.8
Derivatives, at fair value	32.6		7.7
Derivative liability, notional amount	1,550.7		1,371.4
Derivative liability, fair value	(12.3)		(15.7)
Gains (losses) on derivatives	3.5	$ (32.0)
Forward Sales Of Reverse Loans
Derivative [Line Items]
Notional balance	20.0		20.0
Derivatives, at fair value	0.2		0.1
Derivative liability, notional amount	25.0		20.0
Derivative liability, fair value	(0.2)		(0.1)
Gains (losses) on derivatives	0.0	(0.4)
Forward loans IRLCs
Derivative [Line Items]
Notional balance	612.1		0.0
Derivatives, at fair value	4.3		0.0
Derivative liability, notional amount	0.0		540.1
Derivative liability, fair value	0.0		1.3
Gains (losses) on derivatives	5.7	(12.1)
Reverse loans IRLCs
Derivative [Line Items]
Notional balance	21.9		13.8
Derivatives, at fair value	0.5		0.6
Gains (losses) on derivatives	(0.1)	(0.4)
TBA forward MBS trades
Derivative [Line Items]
Notional balance	160.0		804.0
Derivatives, at fair value	1.6		6.6
Derivative liability, notional amount	1,103.0		85.0
Derivative liability, fair value	(10.5)		(0.7)
Interest Rate Swap
Derivative [Line Items]
Notional balance	975.0		0.0
Derivatives, at fair value	22.9		0.0
Derivative liability, notional amount	0.0		670.0
Derivative liability, fair value	0.0		(13.6)
Interest rate option contracts
Derivative [Line Items]
Notional balance	450.0		0.0
Derivatives, at fair value	2.9		0.0
Derivative liability, notional amount	415.0		0.0
Derivative liability, fair value	(1.5)		0.0
TBA Forward Pipelines Trades
Derivative [Line Items]
Gains (losses) on derivatives	(16.4)	47.1
TBA Trades
Derivative [Line Items]
Gains (losses) on derivatives	0.0	0.0
Interest Rate Swap Futures And TBA Forward MBS Trades
Derivative [Line Items]
Gains (losses) on derivatives	14.1	(66.8)
Other
Derivative [Line Items]
Notional balance	189.1		0.0
Derivatives, at fair value	0.3		0.0
Derivative liability, notional amount	7.7		56.4
Derivative liability, fair value	(0.1)		(0.1)
Other Derivatives
Derivative [Line Items]
Gains (losses) on derivatives	0.3	$ 0.4
Forward Trades
Derivative [Line Items]
Notional balance	0.0		100.0
Derivatives, at fair value	$ 0.0		$ 0.4

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