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Residential Whole Loans - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($) loan	Jun. 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	$ 9.3
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	497.5	497.5		588.1
Interest income	3.5	6.5
Purchased Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	216.5	216.5		240.2
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	94.0	94.0		108.9
Without Associated Credit Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, nonaccrual	$ 89.6	$ 89.6		$ 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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