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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Derivative [Line Items]
Notional balance	$ 4,419.2		$ 4,419.2		$ 3,978.7
Derivatives, at fair value	12.6		12.6		21.6
Derivative liability, notional amount	2,730.5		2,730.5		920.2
Derivative liability, fair value	(9.9)		(9.9)		(7.0)
Gains (losses) on derivatives	(46.7)	$ (47.4)	(96.0)	$ (44.0)
Forward Sales Of Reverse Loans
Derivative [Line Items]
Notional balance	20.0		20.0		0.0
Derivatives, at fair value	0.0		0.0		0.0
Derivative liability, notional amount	20.0		20.0		50.0
Derivative liability, fair value	0.0		0.0		(0.1)
Gains (losses) on derivatives	(0.2)	0.0	0.1	0.0
Forward loans IRLCs
Derivative [Line Items]
Notional balance	1,532.4		1,532.4		592.5
Derivatives, at fair value	3.5		3.5		5.1
Gains (losses) on derivatives	(1.0)	(3.2)	(1.6)	2.4
Reverse loans IRLCs
Derivative [Line Items]
Notional balance	22.2		22.2		22.1
Derivatives, at fair value	0.6		0.6		0.6
Gains (losses) on derivatives	0.1	(0.2)	0.1	(0.3)
TBA forward MBS trades
Derivative [Line Items]
Notional balance	2,269.7		2,269.7		1,818.6
Derivatives, at fair value	7.5		7.5		10.1
Derivative liability, notional amount	2,110.5		2,110.5		854.9
Derivative liability, fair value	(8.2)		(8.2)		(6.8)
Interest Rate Swap
Derivative [Line Items]
Notional balance	250.0		250.0		790.0
Derivatives, at fair value	0.5		0.5		3.9
Derivative liability, notional amount	350.0		350.0		0.0
Derivative liability, fair value	(1.5)		(1.5)		0.0
Interest rate option contracts
Derivative [Line Items]
Notional balance	250.0		250.0		750.0
Derivatives, at fair value	0.2		0.2		1.9
Derivative liability, notional amount	250.0		250.0		0.0
Derivative liability, fair value	(0.2)		(0.2)		0.0
TBA Forward Pipelines Trades
Derivative [Line Items]
Gains (losses) on derivatives	4.8	21.2	9.7	4.8
Interest Rate Swap Futures And TBA Forward MBS Trades
Derivative [Line Items]
Gains (losses) on derivatives	(50.6)	(65.2)	(104.3)	(51.1)
Other
Derivative [Line Items]
Derivative liability, notional amount	0.0		0.0		15.3
Derivative liability, fair value	0.0		0.0		(0.1)
Other Derivatives
Derivative [Line Items]
Gains (losses) on derivatives	0.0	0.0	0.0	0.3
Forward Trades
Derivative [Line Items]
Notional balance	0.0		0.0		5.5
Derivatives, at fair value	0.0		0.0		0.0
Forward LHFS Trades
Derivative [Line Items]
Gains (losses) on derivatives	0.3	$ 0.0	0.0	$ 0.0
Treasury Futures Contracts
Derivative [Line Items]
Notional balance	75.0		75.0		0.0
Derivatives, at fair value	$ 0.1		$ 0.1		$ 0.0

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