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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Notional balance	$ 1,803.2		$ 1,803.2		$ 937.8
Derivatives, at fair value	13.6		13.6		7.7
Derivative liability, notional amount	3,663.7		3,663.7		1,371.4
Derivative liability, fair value	(24.3)		(24.3)		(15.7)
Gains (losses) on derivatives	(37.3)	$ 6.0	(81.3)	$ (12.7)
Forward Sales Of Reverse Loans
Derivative [Line Items]
Notional balance	15.0		15.0		20.0
Derivatives, at fair value	0.0		0.0		0.1
Derivative liability, notional amount	31.6		31.6		20.0
Derivative liability, fair value	(0.1)		(0.1)		(0.1)
Gains (losses) on derivatives	(0.2)	(0.5)	(0.2)	(0.3)
Forward loans IRLCs
Derivative [Line Items]
Derivative liability, notional amount	916.9		916.9		540.1
Derivative liability, fair value	1.6		1.6		1.3
Gains (losses) on derivatives	(2.7)	(18.0)	(0.2)	(28.8)
Reverse loans IRLCs
Derivative [Line Items]
Notional balance	20.2		20.2		13.8
Derivatives, at fair value	0.4		0.4		0.6
Gains (losses) on derivatives	0.1	(0.3)	(0.2)	(1.4)
Reverse loan IRLCs - EquityIQ loans
Derivative [Line Items]
Gains (losses) on derivatives	0.0	0.3	0.0	0.0
TBA forward MBS trades
Derivative [Line Items]
Notional balance	1,244.0		1,244.0		804.0
Derivatives, at fair value	11.0		11.0		6.6
Derivative liability, notional amount	863.0		863.0		85.0
Derivative liability, fair value	(10.0)		(10.0)		(0.7)
Interest Rate Swap
Derivative [Line Items]
Notional balance	335.0		335.0		0.0
Derivatives, at fair value	0.8		0.8		0.0
Derivative liability, notional amount	915.0		915.0		670.0
Derivative liability, fair value	(11.0)		(11.0)		(13.6)
Interest rate option contracts
Derivative [Line Items]
Derivative liability, notional amount	900.0		900.0		0.0
Derivative liability, fair value	(1.4)		(1.4)		0.0
TBA Forward Pipelines Trades
Derivative [Line Items]
Gains (losses) on derivatives	33.1	48.4	37.9	124.6
TBA Trades
Derivative [Line Items]
Gains (losses) on derivatives	0.0	(0.1)	0.0	(0.2)
Interest Rate Swap Futures And TBA Forward MBS Trades
Derivative [Line Items]
Gains (losses) on derivatives	(68.6)	(23.8)	(119.7)	(107.5)
Other
Derivative [Line Items]
Derivative liability, notional amount	27.2		27.2		56.4
Derivative liability, fair value	(0.2)		(0.2)		(0.1)
Other Derivatives
Derivative [Line Items]
Gains (losses) on derivatives	(0.1)	0.0	0.2	0.9
Forward Trades
Derivative [Line Items]
Notional balance	189.0		189.0		100.0
Derivatives, at fair value	1.4		1.4		0.4
Derivative liability, notional amount	10.0		10.0		0.0
Derivative liability, fair value	0.0		0.0		$ 0.0
Forward LHFS Trades
Derivative [Line Items]
Gains (losses) on derivatives	$ 1.0	$ 0.0	$ 1.0	$ 0.0

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