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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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