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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Nov. 12, 2020 | Dec. 31, 2019
VIE, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Fair value |  | $ 8.7 |
Other Assets |  |  |
Variable Interest Entity [Line Items] |  |  |
Inventory, real estate, construction in process | $ 0.0 |  | $ 14.5
Residential Loans |  |  |
Variable Interest Entity [Line Items] |  |  |
Proceeds from issuance of securitized debt, net | 540.4 |  |
Non-Agency RMBS Re-Securitization |  |  |
Variable Interest Entity [Line Items] |  |  |
Proceeds from issuance of securitized debt, net | $ 109.0 |  |
RBDHC |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, cumulative percentage ownership after all transactions | 100.00% |  |
RBDHC | VIE, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable interest entity, ownership percentage | 50.00% |  |

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI http://asc.fasb.org/extlink&oid=120401592&loc=SL120429264-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010 + Details
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