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Auto Loans Receivable - Financing Receivable Credit Quality Indicators (Details) $ in Millions | 9 Months Ended |
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Sep. 30, 2024 USD ($) fICOScore | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) fICOScore
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 634.2 |  | $ 285.4
Auto loans receivable, Originated in year before current year | 205.6 |  | 84.6
Auto loans receivable, Originated two years before current year | 56.8 |  | 51.7
Auto loans receivable, Originated three years before current year | 32.1 |  | 17.3
Auto loans receivable, Originated four years before current year | 9.0 |  | 10.6
Auto loans receivable, Originated five years or more before current year | 4.1 |  | 1.6
Total auto loans receivable | 941.8 |  | 451.2
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Current-period gross write-offs, 2024 origination | 3.3 |  |
Current-period gross write-offs, 2023 origination | 20.5 |  |
Current-period gross write-offs, 2022 origination | 11.7 |  |
Current-period gross write-offs, 2021 origination | 6.6 |  |
Current-period gross write-offs, 2020 origination | 1.8 |  |
Current-period gross write-offs, Prior to 2020 origination | 0.7 |  |
Current-period gross write-offs | 44.6 | $ 50.7 |
Palladium |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | 115.3 |  |
Auto loans receivable, Originated in year before current year | 0.0 |  |
Auto loans receivable, Originated two years before current year | 0.0 |  |
Auto loans receivable, Originated three years before current year | 0.0 |  |
Auto loans receivable, Originated four years before current year | 0.0 |  |
Auto loans receivable, Originated five years or more before current year | 0.0 |  |
Total auto loans receivable | $ 115.3 |  |
Palladium | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 736 |  |
Rhodium |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 95.4 |  | 27.6
Auto loans receivable, Originated in year before current year | 19.0 |  | 0.1
Auto loans receivable, Originated two years before current year | 0.1 |  | 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 | $ 114.5 |  | $ 27.7
Rhodium | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 700 |  | 701
Platinum |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 370.2 |  | $ 136.3
Auto loans receivable, Originated in year before current year | 98.8 |  | 14.7
Auto loans receivable, Originated two years before current year | 10.3 |  | 8.2
Auto loans receivable, Originated three years before current year | 5.6 |  | 3.3
Auto loans receivable, Originated four years before current year | 1.8 |  | 3.1
Auto loans receivable, Originated five years or more before current year | 1.3 |  | 0.5
Total auto loans receivable | $ 488.0 |  | $ 166.1
Platinum | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 649 |  | 644
Gold |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 53.1 |  | $ 64.3
Auto loans receivable, Originated in year before current year | 47.0 |  | 35.9
Auto loans receivable, Originated two years before current year | 24.6 |  | 18.5
Auto loans receivable, Originated three years before current year | 12.0 |  | 6.8
Auto loans receivable, Originated four years before current year | 3.7 |  | 4.5
Auto loans receivable, Originated five years or more before current year | 2.0 |  | 0.8
Total auto loans receivable | $ 142.4 |  | $ 130.8
Gold | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 619 |  | 612
Silver |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 0.2 |  | $ 50.2
Auto loans receivable, Originated in year before current year | 35.9 |  | 33.0
Auto loans receivable, Originated two years before current year | 21.3 |  | 16.2
Auto loans receivable, Originated three years before current year | 9.6 |  | 5.2
Auto loans receivable, Originated four years before current year | 2.5 |  | 2.8
Auto loans receivable, Originated five years or more before current year | 0.8 |  | 0.3
Total auto loans receivable | $ 70.3 |  | $ 107.7
Silver | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 583 |  | 583
Bronze |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 0.0 |  | $ 6.7
Auto loans receivable, Originated in year before current year | 4.7 |  | 0.7
Auto loans receivable, Originated two years before current year | 0.4 |  | 6.0
Auto loans receivable, Originated three years before current year | 3.5 |  | 1.5
Auto loans receivable, Originated four years before current year | 0.8 |  | 0.1
Auto loans receivable, Originated five years or more before current year | 0.0 |  | 0.0
Total auto loans receivable | $ 9.4 |  | $ 15.0
Bronze | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 553 |  | 556
Copper |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, Originated in current year | $ 0.0 |  | $ 0.3
Auto loans receivable, Originated in year before current year | 0.2 |  | 0.2
Auto loans receivable, Originated two years before current year | 0.1 |  | 2.8
Auto loans receivable, Originated three years before current year | 1.4 |  | 0.5
Auto loans receivable, Originated four years before current year | 0.2 |  | 0.1
Auto loans receivable, Originated five years or more before current year | 0.0 |  | 0.0
Total auto loans receivable | $ 1.9 |  | $ 3.9
Copper | Weighted Average |  |  |
Auto Loans Receivable |  |  |
Auto loans receivable, FICO Score | fICOScore | 561 |  | 558

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