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Auto Loans Receivable - Financing Receivable Credit Quality Indicators (Details) $ in Millions | 9 Months Ended |
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Sep. 30, 2025 USD ($) fICOScore | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) fICOScore
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 1,206.2 |  | $ 932.0
Auto loans receivable, Originated in year before current year | 698.8 |  | 141.8
Auto loans receivable, Originated two years before current year | 100.4 |  | 4.5
Auto loans receivable, Originated three years before current year | 2.7 |  | 20.6
Auto loans receivable, Originated four years before current year | 10.1 |  | 4.6
Auto loans receivable, Originated five years or more before current year | 1.8 |  | 0.3
Total auto loans receivable | 2,020.0 |  | 1,103.8
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Current-period gross write-offs, 2025 origination | 8.3 |  |
Current-period gross write-offs, 2024 origination | 30.0 |  |
Current-period gross write-offs, 2023 origination | 12.2 |  |
Current-period gross write-offs, 2022 origination | 1.1 |  |
Current-period gross write-offs, 2021 origination | 2.7 |  |
Current-period gross write-offs, Prior to 2021 origination | 0.5 |  |
Current-period gross write-offs | 54.8 | $ 44.6 |
Palladium |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | 490.6 |  | 194.0
Auto loans receivable, Originated in year before current year | 140.8 |  | 0.0
Auto loans receivable, Originated two years before current year | 0.0 |  | 0.0
Auto loans receivable, Originated three years before current year | 0.0 |  | 0.0
Auto loans receivable, Originated four years before current year | 0.0 |  | 0.0
Auto loans receivable, Originated five years or more before current year | 0.0 |  | 0.0
Total auto loans receivable | $ 631.4 |  | $ 194.0
Palladium | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 732 |  | 734
Rhodium |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 236.6 |  | $ 147.6
Auto loans receivable, Originated in year before current year | 109.4 |  | 16.9
Auto loans receivable, Originated two years before current year | 12.2 |  | 0.1
Auto loans receivable, Originated three years before current year | 0.1 |  | 0.0
Auto loans receivable, Originated four years before current year | 0.0 |  | 0.0
Auto loans receivable, Originated five years or more before current year | 0.0 |  | 0.0
Total auto loans receivable | $ 358.3 |  | $ 164.6
Rhodium | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 698 |  | 702
Platinum |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 454.9 |  | $ 525.1
Auto loans receivable, Originated in year before current year | 399.2 |  | 82.3
Auto loans receivable, Originated two years before current year | 59.1 |  | 1.7
Auto loans receivable, Originated three years before current year | 1.1 |  | 4.0
Auto loans receivable, Originated four years before current year | 2.2 |  | 1.0
Auto loans receivable, Originated five years or more before current year | 0.5 |  | 0.1
Total auto loans receivable | $ 917.0 |  | $ 614.2
Platinum | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 652 |  | 651
Gold |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 21.2 |  | $ 64.9
Auto loans receivable, Originated in year before current year | 49.1 |  | 25.0
Auto loans receivable, Originated two years before current year | 17.2 |  | 1.3
Auto loans receivable, Originated three years before current year | 0.7 |  | 7.3
Auto loans receivable, Originated four years before current year | 4.0 |  | 1.6
Auto loans receivable, Originated five years or more before current year | 0.7 |  | 0.1
Total auto loans receivable | $ 92.9 |  | $ 100.2
Gold | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 624 |  | 623
Silver |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 1.9 |  | $ 0.3
Auto loans receivable, Originated in year before current year | 0.2 |  | 13.4
Auto loans receivable, Originated two years before current year | 9.1 |  | 1.2
Auto loans receivable, Originated three years before current year | 0.6 |  | 5.4
Auto loans receivable, Originated four years before current year | 2.4 |  | 1.2
Auto loans receivable, Originated five years or more before current year | 0.4 |  | 0.1
Total auto loans receivable | $ 14.6 |  | $ 21.6
Silver | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 574 |  | 574
Bronze |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 0.8 |  | $ 0.1
Auto loans receivable, Originated in year before current year | 0.1 |  | 4.0
Auto loans receivable, Originated two years before current year | 2.7 |  | 0.2
Auto loans receivable, Originated three years before current year | 0.2 |  | 2.8
Auto loans receivable, Originated four years before current year | 1.2 |  | 0.6
Auto loans receivable, Originated five years or more before current year | 0.2 |  | 0.0
Total auto loans receivable | $ 5.2 |  | $ 7.7
Bronze | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 547 |  | 551
Copper |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 0.2 |  | $ 0.0
Auto loans receivable, Originated in year before current year | 0.0 |  | 0.2
Auto loans receivable, Originated two years before current year | 0.1 |  | 0.0
Auto loans receivable, Originated three years before current year | 0.0 |  | 1.1
Auto loans receivable, Originated four years before current year | 0.3 |  | 0.2
Auto loans receivable, Originated five years or more before current year | 0.0 |  | 0.0
Total auto loans receivable | $ 0.6 |  | $ 1.5
Copper | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 558 |  | 562

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