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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Other financing liabilities, at fair value	$ 818.1		$ 818.1		$ 846.9
Servicing and subservicing fees	211.3	$ 210.8	414.6	$ 415.3
Other counterparties for Pledged MSR liab. | Financing Liabilities
Debt Instrument [Line Items]
Other financing liabilities, at fair value	145.4		145.4		145.8
Financing Liability Excess Servicing Spread [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	248.6		248.6		263.3
Financing Liability Mortgage Servicing Rights Pledged [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	569.6		569.6		583.5
Original Rights to Mortgage Servicing Rights Agreements | Financing Liability Mortgage Servicing Rights Pledged [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	111.0		111.0		115.1
MAV MSR Sale Agreements | Financing Liability Mortgage Servicing Rights Pledged [Member]
Debt Instrument [Line Items]
Other financing liabilities, at fair value	$ 313.2		$ 313.2		$ 322.7

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