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Debt (Summary of Debt) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Revolving secured line of credit balance outstanding |  | $ 169.5 | $ 79.2 |  |
Secured Debt |  | 4,444.1 | 3,990.9 |  |
Senior notes balance outstanding |  | 989.6 | 989.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | 559.2 | 457.7 | $ 480.0 | $ 410.0
Mortgage note | [1] | 8.3 | 8.4 |  |
Revolving Secured Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving secured line of credit balance outstanding |  | 169.5 | 79.2 |  |
Amount available for borrowing | [2] | $ 240.5 | $ 330.8 |  |
Interest rate |  | 7.22% | 7.33% |  |
Warehouse Facility II [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |
Amount available for borrowing | [2] | 400.0 | 400.0 |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 2.0 | $ 1.0 |  |
Interest rate |  | 0.00% | 0.00% |  |
Warehouse Facility IV [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |
Amount available for borrowing | [2] | 300.0 | 300.0 |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 1.0 | $ 1.5 |  |
Interest rate |  | 0.00% | 0.00% |  |
Warehouse Facility V [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |
Amount available for borrowing | [2] | 200.0 | 200.0 |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 1.0 | $ 1.0 |  |
Interest rate |  | 0.00% | 0.00% |  |
Warehouse Facility VI [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 60.0 | $ 0.0 |  |
Amount available for borrowing | [2] | 15.0 | 75.0 |  |
Loans pledged as collateral |  | 76.5 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 2.2 | $ 0.0 |  |
Interest rate |  | 7.37% | 0.00% |  |
Warehouse Facility VIII [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |
Amount available for borrowing | [2] | 200.0 | 200.0 |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 1.0 | $ 0.8 |  |
Interest rate |  | 0.00% | 0.00% |  |
Term ABS 2019-2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 500.0 | $ 500.0 |  |
Loans pledged as collateral |  | 547.4 | 597.3 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 49.1 | $ 47.6 |  |
Interest rate |  | 5.15% | 5.15% |  |
Term ABS 2020-3 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 110.3 |  |
Loans pledged as collateral |  | 0.0 | 418.4 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 42.3 |  |
Interest rate |  | 0.00% | 2.06% |  |
Term ABS 2021-1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 100.0 | $ 100.0 |  |
Loans pledged as collateral |  | 114.1 | 112.8 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 10.1 | $ 8.8 |  |
Interest rate |  | 7.53% | 7.56% |  |
Term ABS 2021-2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 109.3 | $ 188.2 |  |
Loans pledged as collateral |  | 370.5 | 415.5 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 39.2 | $ 37.3 |  |
Interest rate |  | 1.58% | 1.38% |  |
Term ABS 2021-3 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 193.2 | $ 265.0 |  |
Loans pledged as collateral |  | 351.6 | 396.3 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 35.2 | $ 33.8 |  |
Interest rate |  | 1.33% | 1.24% |  |
Term ABS 2021-4 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 178.1 | $ 221.6 |  |
Loans pledged as collateral |  | 235.4 | 255.2 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 21.9 | $ 21.0 |  |
Interest rate |  | 1.51% | 1.46% |  |
Term ABS 2022-1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 350.0 | $ 350.0 |  |
Loans pledged as collateral |  | 376.7 | 378.2 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 30.2 | $ 27.4 |  |
Interest rate |  | 5.03% | 5.03% |  |
Term ABS 2022-2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 200.0 | $ 200.0 |  |
Loans pledged as collateral |  | 209.7 | 212.1 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 16.5 | $ 14.7 |  |
Interest rate |  | 7.66% | 7.66% |  |
Term ABS 2022-3 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 389.9 | $ 389.9 |  |
Loans pledged as collateral |  | 421.0 | 418.9 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 32.1 | $ 28.9 |  |
Interest rate |  | 7.68% | 7.68% |  |
Term ABS 2023-1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 400.0 | $ 400.0 |  |
Loans pledged as collateral |  | 583.3 | 611.6 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 40.9 | $ 38.5 |  |
Interest rate |  | 6.92% | 6.92% |  |
Term ABS 2023-2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 400.0 | $ 400.0 |  |
Loans pledged as collateral |  | 684.4 | 701.7 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 46.1 | $ 42.0 |  |
Interest rate |  | 6.39% | 6.39% |  |
Term ABS 2023-3 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 400.0 | $ 400.0 |  |
Loans pledged as collateral |  | 648.4 | 643.8 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 45.0 | $ 40.3 |  |
Interest rate |  | 6.86% | 6.86% |  |
Term ABS 2023-A [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 200.0 | $ 200.0 |  |
Loans pledged as collateral |  | 301.4 | 273.4 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 20.0 | $ 17.2 |  |
Interest rate |  | 7.51% | 7.51% |  |
Term ABS 2023-5 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 294.0 | $ 294.0 |  |
Loans pledged as collateral |  | 477.1 | 433.9 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 37.3 | $ 52.2 |  |
Interest rate |  | 6.54% | 6.54% |  |
Term ABS 2024-A [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 200.0 |  |  |
Loans pledged as collateral |  | 285.4 | $ 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 19.9 |  |  |
Interest rate |  | 7.45% |  |  |
Term ABS 2024-1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt |  | $ 500.0 |  |  |
Loans pledged as collateral |  | 655.8 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 105.5 |  |  |
Interest rate |  | 6.01% |  |  |
2026 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes balance outstanding |  | $ 400.0 | $ 400.0 |  |
Interest rate |  | 6.625% | 6.625% |  |
2028 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes balance outstanding |  | $ 600.0 | $ 600.0 |  |
Interest rate |  | 9.25% | 9.25% |  |
Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  | 6.87% | 6.88% |  |
Mortgage note |  | $ 8.3 | $ 8.4 |  |
[1] | Measured at amortized cost with fair value disclosed.
[2] | Availability may be limited by the amount of assets pledged as collateral.

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