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Debt (Summary of Debt) (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Feb. 28, 2025 | Dec. 31, 2024 | Dec. 19, 2023 | Mar. 07, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving secured line of credit balance outstanding |  | $ 177.8 | $ 107.3 |  |  |  |  |
Secured Debt |  | 5,019.0 | 5,158.8 |  |  |  |  |
Senior notes balance outstanding |  | 1,089.4 | 1,087.8 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | 490.7 | 477.9 | $ 493.8 |  | $ 501.3 |  |
Revolving Secured Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving secured line of credit balance outstanding |  | 177.8 | 107.3 |  |  |  |  |
Amount available for borrowing | [1] | $ 232.2 | $ 302.7 |  |  |  |  |
Line of credit facility, interest rate |  | 5.39% | 5.69% |  |  |  |  |
Warehouse Facility II [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 125.0 | $ 0.0 |  |  |  |  |
Amount available for borrowing | [1] | 375.0 | 500.0 |  |  |  |  |
Loans pledged as collateral |  | 326.5 | 0.0 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 4.3 | $ 0.0 |  |  |  |  |
Interest rate |  | 5.47% | 0.00% |  |  |  |  |
Warehouse Facility IV [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |  |  |
Amount available for borrowing | [1] | 300.0 | 300.0 |  |  |  |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 0.0 |  |  |  |  |
Interest rate |  | 0.00% | 0.00% |  |  |  |  |
Warehouse Facility V [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |  |  |
Amount available for borrowing | [1] | 250.0 | 250.0 |  |  |  |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 1.0 |  |  |  |  |
Interest rate |  | 0.00% | 0.00% |  |  |  |  |
Warehouse Facility VI [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |  |  |
Amount available for borrowing | [1] | 75.0 | 75.0 |  |  |  |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 0.1 |  |  |  |  |
Interest rate |  | 0.00% | 0.00% |  |  |  |  |
Warehouse Facility VIII [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |  |  |
Amount available for borrowing | [1] | 200.0 | 200.0 |  |  |  |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 0.0 |  |  |  |  |
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 |  | 520.4 | 523.8 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 44.4 | $ 42.1 |  |  |  |  |
Interest rate |  | 5.43% | 5.43% |  |  |  |  |
Term ABS 2021-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 100.0 | $ 100.0 |  |  |  |  |
Loans pledged as collateral |  | 110.3 | 108.8 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 9.2 | $ 8.8 |  |  |  |  |
Interest rate |  | 5.05% | 5.95% |  |  |  |  |
Term ABS 2022-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 44.8 |  |  |  |  |
Loans pledged as collateral |  | 0.0 | 186.3 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 19.7 |  |  |  |  |
Interest rate |  | 0.00% | 6.13% |  |  |  |  |
Term ABS 2022-2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 300.0 | $ 300.0 |  |  |  |  |
Loans pledged as collateral |  | 342.4 | 325.0 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 29.0 | $ 23.6 |  |  |  |  |
Interest rate |  | 6.08% | 6.12% |  |  |  |  |
Term ABS 2022-3 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 127.0 |  |  |  |  |
Loans pledged as collateral |  | 0.0 | 238.8 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 23.0 |  |  |  |  |
Interest rate |  | 0.00% | 8.84% |  |  |  |  |
Term ABS 2023-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 100.7 | $ 209.2 |  |  |  |  |
Loans pledged as collateral |  | 221.6 | 293.5 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 24.9 | $ 26.9 |  |  |  |  |
Interest rate |  | 7.71% | 7.32% |  |  |  |  |
Term ABS 2023-2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 123.1 | $ 242.7 |  |  |  |  |
Loans pledged as collateral |  | 255.5 | 338.4 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 27.4 | $ 28.6 |  |  |  |  |
Interest rate |  | 7.06% | 6.69% |  |  |  |  |
Term ABS 2023-3 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 191.5 | $ 312.9 |  |  |  |  |
Loans pledged as collateral |  | 287.5 | 371.3 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 28.2 | $ 30.0 |  |  |  |  |
Interest rate |  | 7.36% | 6.99% |  |  |  |  |
Term ABS 2023-5 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 193.9 | $ 294.0 |  |  |  |  |
Loans pledged as collateral |  | 259.4 | 327.7 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 28.2 | $ 28.9 |  |  |  |  |
Interest rate |  | 6.74% | 6.54% |  |  |  |  |
Term ABS 2024-A [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 200.0 | $ 200.0 |  |  |  |  |
Loans pledged as collateral |  | 208.5 | 211.1 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 17.4 | $ 16.6 |  |  |  |  |
Interest rate |  | 7.45% | 7.45% |  |  |  |  |
Term ABS 2024-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 402.8 | $ 500.0 |  |  |  |  |
Loans pledged as collateral |  | 512.1 | 580.2 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 42.9 | $ 44.0 |  |  |  |  |
Interest rate |  | 6.09% | 6.01% |  |  |  |  |
Term ABS 2024-2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 550.0 | $ 550.0 |  |  |  |  |
Loans pledged as collateral |  | 608.0 | 608.6 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 46.2 | $ 42.9 |  |  |  |  |
Interest rate |  | 6.21% | 6.21% |  |  |  |  |
Term ABS 2024-3 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 600.0 | $ 600.0 |  |  |  |  |
Loans pledged as collateral |  | 651.7 | 668.7 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 51.5 | $ 47.4 |  |  |  |  |
Interest rate |  | 4.91% | 4.91% |  |  |  |  |
Term ABS 2024-B [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 300.0 | $ 300.0 |  |  |  |  |
Loans pledged as collateral |  | 335.7 | 339.9 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 25.0 | $ 22.5 |  |  |  |  |
Interest rate |  | 6.13% | 6.13% |  |  |  |  |
Term ABS 2025-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 400.0 | $ 400.0 |  |  |  |  |
Loans pledged as collateral |  | 454.2 | 463.5 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 34.4 | $ 32.1 |  |  |  |  |
Interest rate |  | 5.26% | 5.26% |  |  |  |  |
Term ABS 2025-2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 500.0 | $ 500.0 |  |  |  |  |
Loans pledged as collateral |  | 582.2 | 689.8 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 40.5 | $ 39.0 |  |  |  |  |
Interest rate |  | 4.77% | 4.77% |  |  |  |  |
Term ABS 2026-1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Secured Debt |  | $ 450.0 |  |  |  |  |  |
Loans pledged as collateral |  | 533.9 | $ 0.0 |  |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 36.4 |  |  |  |  |  |
Interest rate |  | 4.87% |  |  |  |  |  |
2026 Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 6.625%
2028 Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes balance outstanding |  | $ 600.0 | $ 600.0 |  |  |  |  |
Interest rate |  | 9.25% | 9.25% |  |  |  | 9.25% |
2030 Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes balance outstanding |  | $ 500.0 | $ 500.0 |  |  |  |  |
Interest rate |  | 6.625% | 6.625% |  | 6.625% |  |  |
[1] | Availability may be limited by the amount of assets pledged as collateral.

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