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Residential Whole Loans - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) loan | Mar. 31, 2021 loan | Dec. 31, 2021 USD ($)
Receivables [Abstract] |  |  |
Total residential whole loans | $ 8,300.0 |  | $ 7,900.0
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of whole loans sold | loan | 0 | 0 |
Nonperforming |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, nonaccrual | $ 550.8 |  | 588.1
Purchased Performing Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, nonaccrual | 221.1 |  | 240.2
Purchased Credit Deteriorated Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, nonaccrual | 101.2 |  | 108.9
Interest Income On Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, nonaccrual | 4.3 |  | 3.0
Without Associated Credit Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, nonaccrual | $ 107.2 |  | $ 107.4

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