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Residential Whole Loans - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 loan	Dec. 31, 2021 USD ($)
Receivables [Abstract]
Total residential whole loans	$ 8,200.0	$ 8,200.0		$ 7,900.0
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of whole loans sold | loan		0	0
Interest income	5.0	$ 14.3
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	450.5	450.5		588.1
Interest income	3.7	10.2
Purchased Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	196.2	196.2		240.2
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	86.6	86.6		108.9
Without Associated Credit Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 75.8	$ 75.8		$ 107.4

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Loans, Including Fair Value Loans, Credit Impaired Loans And Other Loans At Carrying Value

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (b)
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Number 229
-Section 1405
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