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v3.20.4

Debt (Narrative) (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) facility | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 03, 2021 USD ($) | Jan. 29, 2021 USD ($) | Jan. 17, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes |  | $ 1,187,800,000 | $ 790,600,000 |  | $ 1,187,800,000 |  |  |  |
Maximum hedging reserve |  |  | $ 1,000,000.0 |  |  |  |  |  |
Percentage of collections on contributed loans |  |  | 6.00% |  |  |  |  |  |
Monthly servicing fee per financing |  |  | 6.00% |  |  |  |  |  |
Repayments of senior notes |  | 148,200,000 | $ 401,800,000 |  | 148,200,000 | $ 0 |  |  |
Loss on extinguishment of debt |  | 1,800,000 | 7,400,000 |  | 1,800,000 | 0 |  |  |
Debt covenants |  |  | 1 |  |  |  |  |  |
Proceeds from issuance of senior notes |  |  | $ 0 |  | 800,000,000.0 | 0 |  |  |
Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt maturity date |  |  | Jun. 22, 2023 |  |  |  |  |  |
Line of credit facility | [1] |  | $ 340,000,000.0 |  |  |  |  |  |
Line of credit facility future maximum borrowing capacity |  |  | $ 305,000,000.0 |  |  |  |  |  |
Percentage of net book value of loans |  |  | 80.00% |  |  |  |  |  |
Warehouse Facilities [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of net book value of loans |  |  | 80.00% |  |  |  |  |  |
Number of warehouse facilities | facility |  |  | 6 |  |  |  |  |  |
Debt financing amount |  |  | $ 1,250,000,000.0 |  |  |  |  |  |
Warehouse Facility II [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt maturity date | [2] |  | Jul. 12, 2022 |  |  |  |  |  |
Debt financing amount |  | $ 400,000,000.0 | $ 400,000,000.0 | [3] | $ 400,000,000.0 |  |  |  |
Interest rate |  | 0.00% | 1.90% |  | 0.00% |  |  |  |
Warehouse Facility IV [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt maturity date | [2] |  | Jul. 26, 2022 |  |  |  |  |  |
Debt financing amount |  | $ 300,000,000.0 | $ 300,000,000.0 | [3] | $ 300,000,000.0 |  |  |  |
Interest rate |  | 0.00% | 0.00% |  | 0.00% |  |  |  |
Warehouse Facility V [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt maturity date | [4] |  | Dec. 18, 2023 |  |  |  |  |  |
Debt financing amount |  | $ 100,000,000.0 | $ 125,000,000.0 | [3] | $ 100,000,000.0 |  |  |  |
Interest rate |  | 0.00% | 0.00% |  | 0.00% |  |  |  |
Warehouse Facility VI [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt maturity date | [2] |  | Sep. 30, 2022 |  |  |  |  |  |
Debt financing amount |  |  | $ 75,000,000.0 |  |  |  |  |  |
Interest rate |  | 0.00% | 0.00% |  | 0.00% |  |  |  |
2021 Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes |  | $ 151,800,000 | $ 0 |  | $ 151,800,000 | $ 300,000,000.0 |  |  | $ 151,800,000
Interest rate |  | 6.125% | 0.00% |  | 6.125% | 6.125% |  |  |
2023 Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes |  | $ 250,000,000.0 | $ 0 |  | $ 250,000,000.0 |  |  |  |
Interest rate |  | 7.375% | 0.00% |  | 7.375% |  |  |  |
2024 Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes |  | $ 400,000,000.0 | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  |  |
Debt maturity date |  |  | Dec. 31, 2024 |  |  |  |  |  |
Debt financing amount |  |  | $ 400,000,000.0 |  |  |  |  |  |
Interest rate |  | 5.125% | 5.125% |  | 5.125% |  |  |  |
2026 Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes |  | $ 400,000,000.0 | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  |  |
Debt maturity date |  |  | Mar. 15, 2026 |  |  |  |  |  |
Debt financing amount |  |  | $ 400,000,000.0 |  |  |  |  |  |
Interest rate |  | 6.625% | 6.625% |  | 6.625% |  |  |  |
Mortgage [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes |  | $ 11,300,000 | $ 10,500,000 |  | $ 11,300,000 |  |  |  |
Debt maturity date |  |  | Aug. 06, 2023 |  |  |  |  |  |
Debt financing amount |  |  | $ 12,000,000.0 |  |  |  |  |  |
Interest rate |  | 3.21% | 1.65% |  | 3.21% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 187.50% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility II [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | [3] |  | 175.00% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility V [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | [3] |  | 225.00% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Facility VI [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | [3] |  | 200.00% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Mortgage [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 150.00% |  |  |  |  |  |
Prime Rate [Member] | Revolving Secured Line Of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 87.50% |  |  |  |  |  |
Subsequent Event [Member] | Warehouse Facility II [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt financing amount |  |  |  |  |  |  |  | $ 300,000,000.0 |
Subsequent Event [Member] | Warehouse Facility IV [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt financing amount |  |  |  |  |  |  | $ 400,000,000.0 |  |
[1] | The amount of the facility will decrease to $305.0 million on June 22, 2022.
[2] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.
[3] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[4] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on December 16, 2025 will be due on that date.

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